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The average person has 5 million hairs. Hair grows all over your body except on your lips, palms, and the soles of your feet. It takes about a month for healthy hair to grow half an inch. Most hairs grow for up to six years and then fall out. New hairs grow in their place.

Hair helps keep you warm. It also protects your eyes, ears and nose from small particles in the air. Common problem with the hair and scalp include hair loss, infections, and flaking.

Vaginitis, also called vulvovaginitis, is an inflammation or infection of the vagina. It can also affect the vulva, which is the external part of a woman's genitals. Vaginitis can cause itching, pain, discharge, and odor.

Vaginitis is common, especially in women in their reproductive years. It usually happens when there is a change in the balance of bacteria or yeast that are normally found in your vagina. There are different types of vaginitis, and they have different causes, symptoms, and treatments.

Bacterial vaginosis (BV) is the most common vaginal infection in women ages 15-44. It happens when there is an imbalance between the "good" and "harmful" bacteria that are normally found in a woman's vagina. Many things can change the balance of bacteria, including:

• Taking antibiotics
• Douching
• Using an intrauterine device (IUD)
• Having unprotected sex with a new partner
• Having many sexual partners

Yeast infections (candidiasis) happen when too much candida grows in the vagina. Candida is the scientific name for yeast. It is a fungus that lives almost everywhere, including in your body. You may have too much growing in the vagina because of:

• Antibiotics
• Pregnancy
• Diabetes, especially if it is not well-controlled
• Corticosteroid medicines

Trichomoniasis can also cause vaginitis. Trichomoniasis is a common sexually transmitted disease. It is caused by a parasite.

You can also have vaginitis if you are allergic or sensitive to certain products that you use. Examples include vaginal sprays, douches, spermicides, soaps, detergents, or fabric softeners. They can cause burning, itching, and discharge.

Hormonal changes can also cause vaginal irritation. Examples are when you are pregnant or breastfeeding, or when you have gone through menopause.

Sometimes you can have more than one cause of vaginitis at the same time.

The symptoms of vaginitis depend on which type you have.

With BV, you may not have symptoms. You could have a thin white or gray vaginal discharge. There may be an odor, such as a strong fish-like odor, especially after sex.

Yeast infections produce a thick, white discharge from the vagina that can look like cottage cheese. The discharge can be watery and often has no smell. Yeast infections usually cause the vagina and vulva to become itchy and red.

You may not have symptoms when you have trichomoniasis. If you do have them, they include itching, burning, and soreness of the vagina and vulva. You may have burning during urination. You could also have gray-green discharge, which may smell bad.

To find out the cause of your symptoms, your health care provider may:

• Ask you about your medical history
• Do a pelvic exam
• Look for vaginal discharge, noting its color, qualities, and any odor
• Study a sample of your vaginal fluid under a microscope

In some cases, you may need more tests.

The treatment depends on which type of vaginitis you have.

BV is treatable with antibiotics. You may get pills to swallow, or cream or gel that you put in your vagina. During treatment, you should use a condom during sex or not have sex at all.

Yeast infections are usually treated with a cream or with medicine that you put inside your vagina. You can buy over-the-counter treatments for yeast infections, but you need to be sure that you do have a yeast infection and not another type of vaginitis. See your health care provider if this is the first time you have had symptoms. Even if you have had yeast infections before, it is a good idea to call your health care provider before using an over-the-counter treatment.

The treatment for trichomoniasis is usually a single-dose antibiotic. Both you and your partner(s) should be treated, to prevent spreading the infection to others and to keep from getting it again.

If your vaginitis is due to an allergy or sensitivity to a product, you need to figure out which product is causing the problem. It could be a product that you started using recently. Once you figure it out, you should stop using the product.

If the cause of your vaginitis is a hormonal change, your health care provider may give you estrogen cream to help with your symptoms.

It is important to treat BV and trichomoniasis, because having either of them can increase your risk for getting HIV or another sexually transmitted disease. If you are pregnant, BV or trichomoniasis can increase your risk for preterm labor and preterm birth.

To help prevent vaginitis:

• Do not douche or use vaginal sprays
• Use a latex condom when having sex. If your or your partner is allergic to latex, you can use polyurethane condoms.
• Avoid clothes that hold in heat and moisture
• Wear cotton underwear

Acute flaccid myelitis (AFM) is a neurologic disease. It is rare, but serious. It affects an area of the spinal cord called gray matter. This can cause the muscles and reflexes in the body to become weak.

Because of these symptoms, some people call AFM a "polio-like" illness. But it is different from polio. AFM is not caused by polioviruses.

AFM can be caused by several different viruses. Researchers think that enteroviruses have been causing the recent increases in the number of children with AFM. AFM can also be caused by other viruses, including flaviviruses, herpesviruses, and adenoviruses.

Most people with AFM had a mild respiratory illness or fever (like you would get from a viral infection) before they got AFM.

Anyone can get AFM, but most cases (more than 90%) have been in young children.

Most people with AFM will suddenly have:

• Arm or leg weakness
• A loss of muscle tone and reflexes

Some people also have other symptoms, including:

• Facial drooping/weakness
• Trouble moving the eyes
• Drooping eyelids
• Trouble swallowing
• Slurred speech
• Pain in the arms, legs, back, or neck

Sometimes AFM can weaken the muscles that you need for breathing. This can lead to respiratory failure, which is very serious. If you get respiratory failure, you may need to use a ventilator (breathing machine) to help you breathe.

If you or your child develops any of these symptoms, get medical care right away.

AFM causes many of the same symptoms as other neurologic diseases, such as transverse myelitis and Guillain-Barre syndrome. This can make it difficult to diagnose. To find out if you have AFM, your doctor may use:

• A neurologic exam, including looking at where there is weakness, poor muscle tone, and decreased reflexes
• An MRI to look at the spinal cord and brain
• Lab tests on the cerebrospinal fluid (the fluid around the brain and spinal cord)
• Nerve conduction and electromyography (EMG) studies. These tests check nerve speed and the response of muscles to the messages from the nerves.

It is important that the tests are done as soon as possible after the symptoms start.

There is no specific treatment for AFM. A doctor who specializes in treating brain and spinal cord illnesses (neurologist) may recommend treatments for specific symptoms. For example, physical and/or occupational therapy may help with arm or leg weakness. Researchers do not know the long-term outcomes of people who get AFM.

There is no specific way to prevent AFM. But you can take steps to prevent getting sick from a virus by:

• Washing your hands often with soap and water
• Avoiding touching your face with unwashed hands
• Avoiding close contact with people who are sick
• Cleaning and disinfecting surfaces that you frequently touch, including toys
• Covering coughs and sneezes with a tissue or upper shirt sleeve, not hands
• Staying home when sick

Centers for Disease Control and Prevention

Birthmarks are abnormalities of the skin that are present when a baby is born. There are two types of birthmarks. Vascular birthmarks are made up of blood vessels that haven't formed correctly. They are usually red. Two types of vascular birthmarks are hemangiomas and port-wine stains. Pigmented birthmarks are made of a cluster of pigment cells which cause color in skin. They can be many different colors, from tan to brown, gray to black, or even blue. Moles can be birthmarks.

No one knows what causes many types of birthmarks, but some run in families. Your baby's doctor will look at the birthmark to see if it needs any treatment or if it should be watched. Pigmented birthmarks aren't usually treated, except for moles. Treatment for vascular birthmarks includes laser surgery.

Most birthmarks are not serious, and some go away on their own. Some stay the same or get worse as you get older. Usually birthmarks are only a concern for your appearance. But certain types can increase your risk of skin cancer. If your birthmark bleeds, hurts, itches, or becomes infected, call your health care provider.

Canker sores are small, round sores in your mouth. They can be on the inside of your cheek, under your tongue, or in the back of your throat. They usually have a red edge and a gray center. They can be quite painful. They are not the same as cold sores, which are caused by herpes simplex.

Canker sores aren't contagious. They may happen if you have a viral infection. They may also be triggered by stress, food allergies, lack of vitamins and minerals, hormonal changes or menstrual periods. In some cases the cause is unknown.

In most cases, the sores go away by themselves. Some ointments, creams or rinses may help with the pain. Avoiding hot, spicy food while you have a canker sore also helps.

It is hard when your baby is sick. Common health problems in babies include colds, coughs, fevers, and vomiting. Babies also commonly have skin problems, like diaper rash or cradle cap.

Many of these problems are not serious. It is important to know how to help your sick baby, and to know the warning signs for more serious problems. Trust your intuition - if you are worried about your baby, call your health care provider right away.

Hepatitis is inflammation of the liver. Inflammation is swelling that happens when tissues of the body are injured or infected. It can damage your liver. This swelling and damage can affect how well your liver functions.

Hepatitis A is a type of viral hepatitis. It causes an acute, or short-term, infection. This means that people usually get better without treatment after a few weeks.

Thanks to a vaccine, hepatitis A is not very common in the United States.

Hepatitis A is caused by the hepatitis A virus. The virus spreads through contact with an infected person's stool. This can happen if you:

• Eat food made by someone who has the virus and did not properly wash their hands after using the bathroom
• Drink contaminated water or eat foods that were rinsed with contaminated water
• Have close personal contact with someone who has hepatitis A. This could be through certain types of sex (like oral-anal sex), taking care of someone who is ill, or using illegal drugs with others.

Although anyone can get hepatitis A, you are at higher risk if you:

• Travel to developing countries
• Have sex with someone who has hepatitis A
• Are a man who has sex with men
• Use illegal drugs
• Are experiencing homelessness
• Live with or care for someone who has hepatitis A
• Live with or care for a child recently adopted from a country where hepatitis A is common

Not everyone with hepatitis A has symptoms. Adults are more likely to have symptoms than children. If you do have symptoms, they usually start 2 to 7 weeks after infection. They can include:

• Dark yellow urine
• Diarrhea
• Fatigue
• Fever
• Gray- or clay-colored stools
• Joint pain
• Loss of appetite
• Nausea and/or vomiting
• Abdominal pain
• Yellowish eyes and skin, called jaundice

The symptoms usually last less than 2 months, although some people can be ill for as long as 6 months.

You are at a higher risk of getting a more severe infection from hepatitis A if you also have HIV, hepatitis B, or hepatitis C.

In rare cases, hepatitis A may lead to liver failure. This is more common in adults over age 50 and in people who have another liver.

To diagnose hepatitis A, your health care provider may use many tools:

• A medical history, which includes asking about your symptoms
• A physical exam
• Blood tests, including tests for viral hepatitis

There is no specific treatment for hepatitis A. The best way to recover is to rest, drink plenty of liquids, and eat healthy foods. Your provider may also suggest medicines to help relieve symptoms. In more severe cases, you may need care in a hospital.

The best way to prevent hepatitis A is to get the hepatitis A vaccine. It is also important to have good hygiene, especially washing your hands thoroughly after you go to the bathroom.

National Institute of Diabetes and Digestive and Kidney Diseases

Hepatitis is inflammation of the liver. Inflammation is swelling that happens when tissues of the body are injured or infected. It can damage your liver. This swelling and damage can affect how well your liver functions.

Hepatitis B is a type of viral hepatitis. It can cause an acute (short-term) or chronic (long-term) infection. People with an acute infection usually get better on their own without treatment. Some people with chronic hepatitis B will need treatment.

Thanks to a vaccine, hepatitis B is not very common in the United States. It is more common in certain parts of the world, such as sub-Saharan Africa and parts of Asia.

Hepatitis B is caused by the hepatitis B virus. The virus spreads through contact with blood, semen, or other body fluids from a person who has the virus.

Anyone can get hepatitis B, but the risk is higher in:

• Infants born to mothers who have hepatitis B
• People who inject drugs or share needles, syringes, and other types of drug equipment
• Sex partners of people with hepatitis B, especially if they are not using latex or polyurethane condoms during sex
• Men who have sex with men
• People who live with someone who has hepatitis B, especially if they use the same razor, toothbrush, or nail clippers
• Health care and public-safety workers who are exposed to blood on the job
• Hemodialysis patients
• People who have lived in or traveled often to parts of the world where hepatitis B is common
• Have diabetes, hepatitis C, or HIV

Often, people with hepatitis B don't have symptoms. Adults and children over 5 are more likely to have symptoms than younger children.

Some people with acute hepatitis B have symptoms 2 to 5 months after infection. These symptoms can include:

• Dark yellow urine
• Diarrhea
• Fatigue
• Fever
• Gray- or clay-colored stools
• Joint pain
• Loss of appetite
• Nausea and/or vomiting
• Abdominal pain
• Yellowish eyes and skin, called jaundice

If you have chronic hepatitis B, you may not have symptoms until complications develop. This could be decades after you were infected. For this reason, hepatitis B screening is important, even if you have no symptoms. Screening means that you are tested for a disease even though you don't have symptoms. If you are at high risk, your health care provider may suggest screening.

In rare cases, acute hepatitis B can cause liver failure.

Chronic hepatitis B can develop into a serious disease that causes long-term health problems such as cirrhosis (scarring of the liver), liver cancer, and liver failure.

If you have ever had hepatitis B, the virus may become active again, or reactivated, later in life. This could start to damage the liver and cause symptoms.

To diagnose hepatitis B, your health care provider may use many tools to make a diagnosis:

• A medical history, which includes asking about your symptoms
• A physical exam
• Blood tests, including tests for viral hepatitis

If you have acute hepatitis B, you probably don't need treatment. Some people with chronic hepatitis B don't need treatment. But if you have a chronic infection and blood tests show that hepatitis B could be damaging your liver, you may need to take antiviral medicines.

The best way to prevent hepatitis B is to get the hepatitis B vaccine.

You can also reduce your chance of hepatitis B infection by:

• Not sharing drug needles or other drug materials
• Wearing gloves if you have to touch another person's blood or open sores
• Making sure your tattoo artist or body piercer uses sterile tools
• Not sharing personal items, such as toothbrushes, razors, or nail clippers
• Using a latex condom during sex. If your or your partner is allergic to latex, you can use polyurethane condoms.

If you think you have been in contact with the hepatitis B virus, see your health care provider right away. Your provider may give you a dose of the hepatitis B vaccine to prevent infection. In some cases, your provider may also give you a medicine called hepatitis B immune globulin (HBIG). You need to get the vaccine and the HBIG (if needed) as soon as possible after coming into contact with the virus. It is best if you can get them within 24 hours.

National Institute of Diabetes and Digestive and Kidney Diseases

Hepatitis is inflammation of the liver. Inflammation is swelling that happens when tissues of the body are injured or infected. Inflammation can damage organs.

There are different types of hepatitis. One type, hepatitis C, is caused by the hepatitis C virus (HCV). Hepatitis C can range from a mild illness lasting a few weeks to a serious, lifelong illness.

Hepatitis C can be acute or chronic:

• Acute hepatitis C is a short-term infection. The symptoms can last up to 6 months. Sometimes your body is able to fight off the infection and the virus goes away. But for most people, an acute infection leads to chronic infection.
• Chronic hepatitis C is a long-lasting infection. If it is not treated, it can last for a lifetime and cause serious health problems, including liver damage, cirrhosis (scarring of the liver), liver cancer, and even death.

Hepatitis C spreads through contact with the blood of someone who has HCV. This contact may be through:

• Sharing drug needles or other drug materials with someone who has HCV. In the United States, this is the most common way that people get hepatitis C.
• Getting an accidental stick with a needle that was used on someone who has HCV. This can happen in health care settings.
• Being tattooed or pierced with tools or inks that were not sterilized after being used on someone who has HCV
• Having contact with the blood or open sores of someone who has HCV
• Sharing personal care items that may have come in contact with another person's blood, such as razors or toothbrushes
• Being born to a mother with HCV
• Having unprotected sex with someone who has HCV

Before 1992, hepatitis C was also commonly spread through blood transfusions and organ transplants. Since then, there has been routine testing of the U.S. blood supply for HCV. It is now very rare for someone to get HCV this way.

You are more likely to get hepatitis C if you:

• Have injected drugs
• Had a blood transfusion or organ transplant before July 1992
• Have hemophilia and received clotting factor before 1987
• Have been on kidney dialysis
• Have been in contact with blood or infected needles at work
• Have had tattoos or body piercings
• Have worked or lived in a prison
• Were born to a mother with hepatitis C
• Have HIV
• Have had more than one sex partner in the last 6 months
• Have had a sexually transmitted disease
• Are a man who has had sex with men (MSM)

If you are at high risk for hepatitis C, your health care provider will likely recommend that you get tested for it.

Most people with hepatitis C have no symptoms. Some people with acute hepatitis C do have symptoms within 1 to 3 months after they are exposed to the virus. These symptoms may include:

• Dark yellow urine
• Fatigue
• Fever
• Gray- or clay-colored stools
• Joint pain
• Loss of appetite
• Nausea and/or vomiting
• Pain in your abdomen (belly)
• Jaundice (yellowish eyes and skin)

If you have chronic hepatitis C, you probably will not have symptoms until it causes complications. This can happen decades after you were infected. For this reason, hepatitis C screening is important, even if you have no symptoms.

Without treatment, hepatitis C may lead to cirrhosis, liver failure, and liver cancer. Early diagnosis and treatment of hepatitis C can prevent these complications.

Providers diagnose hepatitis C based on your medical history, a physical exam, and blood tests.

If you do have hepatitis C, you may need additional tests to check for liver damage. These tests may include other blood tests, an ultrasound of the liver, and a liver biopsy.

Treatment for hepatitis C is with antiviral medicines. They can cure the disease in most cases.

If you have acute hepatitis C, your provider may wait to see if your infection becomes chronic before starting treatment.

If your hepatitis C causes cirrhosis, you should see a doctor who specializes in liver diseases. Treatments for health problems related to cirrhosis include medicines, surgery, and other medical procedures. If your hepatitis C leads to liver failure or liver cancer, you may need a liver transplant.

There is no vaccine for hepatitis C. But you can help protect yourself from hepatitis C infection by:

• Not sharing drug needles or other drug materials.
• Wearing gloves if you have to touch another person's blood or open sores.
• Making sure your tattoo artist or body piercer uses sterile tools and unopened ink.
• Not sharing personal items such toothbrushes, razors, or nail clippers.
• Using a latex condom during sex. If your or your partner is allergic to latex, you can use polyurethane condoms.

NIH: National Institute of Diabetes and Digestive and Kidney Diseases

Marijuana is a green, brown, or gray mix of dried, crumbled parts from the marijuana plant. The plant contains chemicals which act on your brain and can change your mood or consciousness.

There are many different ways that people use marijuana, including:

• Rolling it up and smoking it like a cigarette or cigar
• Smoking it in a pipe
• Mixing it in food and eating it
• Brewing it as a tea
• Smoking oils from the plant ("dabbing")
• Using electronic vaporizers ("vaping")

Marijuana can cause both short-term and long-term effects.

Short term:

While you are high, you may experience:

• Altered senses, such as seeing brighter colors
• Altered sense of time, such as minutes seeming like hours
• Changes in mood
• Problems with body movement
• Trouble with thinking, problem-solving, and memory
• Increased appetite

Long term:

In the long term, marijuana can cause health problems, such as:

• Problems with brain development. People who started using marijuana as teenagers may have trouble with thinking, memory, and learning.
• Coughing and breathing problems, if you smoke marijuana frequently
• Problems with child development during and after pregnancy, if a woman smokes marijuana while pregnant

It is possible to overdose on marijuana, if you take a very high dose. Symptoms of an overdose include anxiety, panic, and a rapid heartbeat. In rare cases, an overdose can cause paranoia and hallucinations. There are no reports of people dying from using just marijuana.

After using marijuana for a while, it is possible to get addicted to it. You are more likely to become addicted if you use marijuana every day or you started using it when you were a teenager. If you are addicted, you will have a strong need to take the drug. You may also need to smoke more and more of it to get the same high. When you try to quit, you may have mild withdrawal symptoms such as:

• Irritability
• Trouble sleeping
• Decreased appetite
• Anxiety
• Cravings

The marijuana plant has chemicals that can help with some health problems. More states are making it legal to use the plant as medicine for certain medical conditions. But there isn't enough research to show that the whole plant works to treat or cure these conditions. The U.S. Food and Drug Administration (FDA) has not approved the marijuana plant as a medicine. Marijuana is still illegal at the national level.

However, there have been scientific studies of cannabinoids, the chemicals in marijuana. The two main cannabinoids that are of medical interest are THC and CBD. The FDA has approved two drugs that contain THC. These drugs treat nausea caused by chemotherapy and increase appetite in patients who have severe weight loss from AIDS. There is also a liquid drug that contains CBD. It treats two forms of severe childhood epilepsy. Scientists are doing more research with marijuana and its ingredients to treat many diseases and conditions.

NIH: National Institute on Drug Abuse