Health A-Z Medical Reference

Hematologists are specialized doctors who research, diagnose, treat, and help prevent blood-related conditions and disease. Find out why you might need to see one.

There are many causes of armpit pain, from a mild muscle strain to more serious conditions like breast cancer.

These white blood cells could be a sign of infection. Learn what else causes leukocytes in urine and how to treat the problem.

Hookworms are parasites that can live in your intestines or under your skin. Get the facts on the symptoms, treatment, and prevention in people.

Find out what the term cisgender means and how it differs from transgender.

Malaise is when you feel a sense of unease or a lack of well-being. From viral infections to heart disease, many disorders can lead to it. Find out what may be causing your malaise and what you can do at home to feel better.

You'll meet one of these specialists if you plan to have surgery. Find out why an anesthesiologist has an important job to do, and learn about the training they get.

Peeing less than usual can sometimes be a sign something’s wrong, but most of the time, it’s nothing serious.

Melanin is a natural skin pigment that plays a role in the color of your hair, skin, and eyes. Learn what else it does in the body.

Ascariasis is a kind of roundworm infection that affects about 1 billion people around the world. Find out more about its symptoms and how it's treated.

Physiology is the study of how the human body functions. Learn what it can tell us about health and how it applies to medicine.

Phlebotomy is when someone uses a needle to take blood from your vein. It’s also called a blood draw or venipuncture. WebMD explains the process, risks, and side effects.

Best known as a household cleaner, borax can cause several health issues if you swallow it by itself or breathe it.

A dip in the hot tub can help you relax and soothe sore muscles, but there are risks. Learn what steps to take before you soak.

Find out what kinds of medical problems a urologist can treat, and learn about the training this specialist has to get.

If you wake up feeling weak, woozy, or unsteady, it can be a sign of anything from not getting enough to drink to a medical condition like sleep apnea. Learn the common causes of morning dizziness and how to manage those conditions.

Find out the conditions that could be giving you a feeling of "pins and needles" in your leg, and learn what you can do about it.

A walk down a cold, windy street can send a shivery tingle up and down your body, but so can some health conditions like the flu, kidney stones, or an underactive thyroid. Find out what causes the chills and what you can do about it.

If your feet are cold, you could have a condition like Raynaud's disease or peripheral artery disease. Find out what's causing your symptoms and learn the treatment options.

There's a lump in your throat, but it's not because you're sad. Lots of health issues can make your throat feel tight. Find out what they are and what you can do.

Your lips are super-sensitive. But some conditions can make them go numb or tingly. Learn what can cause a loss of feeling, and what you should do.

Yellow eyes can happen in more than just newborns. The whites of your eyes turn yellow when you have jaundice. Learn about this condition, why it causes yellow eyes, and possible treatments.

Numbness in your toes can be caused by any number of things, some serious, some not so. We take a look at some suspects.

Learn more about why you may be experiencing numbness in fingers. Usually, the feeling is harmless and goes away on its own. But in some cases, you should tell your doctor or get help right away.

If your hand or arm gets numb, the cause could range from sleeping in one position for too long to a medical condition like carpal tunnel syndrome or diabetes. No matter the reason, treatments can give you relief as well as get to the root of the problem.