Health A-Z Medical Reference

A radiographer is the person who uses medical technology like X-rays, CT scans, and sonograms to make images of the inside of your body. Learn more about what they do and how to get ready for your imaging appointment.

You might hear your doctor talk about "MCH" levels when they explain the results of certain blood tests. Find out what these measurements mean and how doctors use them diagnose conditions.

Flashing lights, dizziness, ringing in your ears: They could all be part of aura, an early warning sign of migraine, a seizure, or a stroke. Here’s what to look out for and how to manage the symptoms.

Systemic mastocytosis can lead to itchy skin, headaches, and more. Learn the symptoms, diagnosis, and treatments for this condition, which causes a buildup in your body of too many mast cells -- a type of white blood cell.

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.

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.

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.

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.