Diseases & Conditions

These masses of minerals form in your bladder. That's the organ that holds your urine. Both men and women get bladder stones, but they are more common in men over 50.

We all have ear wax. It's natural and healthy. But what is it, exactly? Why do we have it, and what does ear wax do for our ears? Let's take a moment to learn about it.

This immune system reaction is triggered by certain foods. Your immune system can react if you eat, touch or breathe in particles of the food. Even a very small amount can trigger a reaction. Many types of foods cause immune system reactions. Some common examples are shellfish, peanuts, tree nuts, eggs, milk, wheat and soy.

This immune system reaction is triggered by peanuts. With this allergy, your immune system reacts if you eat peanuts or foods that have peanuts in them. Even a very small amount can trigger it. Some people with this allergy react to touching peanuts, or to breathing in dust with peanut particles in it.

This condition is a dangerous overheating of your body. It happens when your core temperature reaches 104 degrees Fahrenheit (40° Celsius). Heat stroke is a medical emergency.

This skin and tissue damage comes from extreme cold. Frostbite can happen to any part of your body. And it can be very serious.

This is a problem with your thyroid. That's a hormone-producing gland in your neck. The thyroid makes hormones that help control many activities in your body. These hormones affect things like your metabolism and heart rate. With hyperthyroidism, your thyroid makes more hormones than your body needs.

This is a problem with your thyroid. That's a hormone-producing gland in your neck. The thyroid makes hormones that help control many activities in your body. These hormones affect things like your metabolism and heart rate. With hypothyroidism, your thyroid does not make enough hormones to meet your body's needs.

This is a growth of cells in your thyroid. The thyroid is a hormone-producing gland in your neck. It makes hormones that help control many activities in your body. A thyroid nodule can interfere with your thyroid's function.

This condition is an abnormally low number of platelet cells in your blood. Platelets are tiny cells that help your blood clot to stop bleeding. If your platelets are destroyed, or if your body can't produce enough new cells to meet your needs, you can develop a shortage. You can be at risk for excessive bleeding, including internal bleeding. This is a medical emergency.

Radon is a gas that comes up through the ground. You can't see it or smell it. But when you're exposed to it, especially for many years, it can be harmful. It's a leading cause of lung cancer.

This is a dangerous buildup of serotonin in your body. That's a chemical your body makes naturally. It's used by your brain and your nervous system. It helps regulate things like body temperature, digestion and breathing. But too much serotonin can be bad for you.

This is a life-threatening condition. It's an immune response that's so intense it causes inflammation throughout your body. It can lead to organ failure.

This is a label given to a group of disorders. In these disorders, nerves or blood vessels are compressed in the space between your collarbone and the underlying rib. This space is called the "thoracic outlet."

This is an open sore that usually forms on your leg above your ankle. Venous ulcers can be painful, and they can become infected. They are often slow to heal.

Your nose gets stuffy when blood vessels in the inner lining of your nose become inflamed. You may have a runny nose, too, which makes breathing even harder. For most people, a stuffy nose isn't a serious problem. But it can be a nuisance.

This dangerous disease is caused by a virus. It can infect all mammals. The virus spreads through saliva, and attacks the brain and spinal cord. By the time symptoms appear, it's almost always fatal.

Watch this to learn what varicose veins are and how to care for your legs at home.

This is excessive sweating. With this condition, you sweat a lot even when you aren't active or overheated. You may find that you're constantly trying to control your sweating. This can disrupt your daily life.

This problem involves the blood vessels of the fingers (and sometimes other parts of the body). With it, certain triggers like cold or stress cause your blood vessels to constrict. This reduces the blood supply. It makes your fingers feel cold and numb or painful.

Watch this to learn what happens during endovenous laser ablation for varicose veins and how to recover.

Watch this video to learn what happens during foam sclerotherapy for varicose veins and how to recover.

Many of us have health problems that aren't easily seen by others. These are things like feeling pain all the time, feeling very tired, or having a hard time with thoughts or feelings. We call these "non-apparent disabilities." And if you have one, you know others don't always understand what you're going through. So let's take a moment to learn how to deal with this issue.

This is when a person is missing most or all of their ability to both hear and see. This makes it hard for them to experience the world. Let's take a moment to learn more.

Watch this to learn what happens during microphlebectomy for varicose veins and how to recover.

Watch this to learn what happens during endovenous glue treatment for varicose veins and how to recover.

This is when a person has two or more impairments. These can involve the body and brain. A person with multiple disabilities can have trouble doing things that are easy for others. When kids have multiple disabilities, it's often much harder for them to learn at school. Let's take a moment to find out more.

This is when your body lacks an enzyme that's needed to digest fructose. Fructose is a type of sugar found in many fruits, vegetables, sweeteners and other foods. With this condition, eating fructose can lead to serious health problems. Let's take a moment to learn more.

This condition is a problem with your blood. If you have anemia, you don't have enough healthy red blood cells. These are the cells that carry oxygen through your bloodstream. Without enough red blood cells, your body's cells don't receive enough oxygen.

These are disorders that are caused by a problem with our genetic code, which we call "DNA." You can be born with a genetic disorder. Or, you can develop one later in life. Let's take a few minutes to learn more.

This is a disorder of the immune system. It affects the thyroid. That's a hormone-producing gland in your neck. Your thyroid makes hormones that help control many activities in your body. Graves' disease causes your thyroid to make more thyroid hormone than your body needs. We call that "hyperthyroidism."

This is a disorder of the immune system. It affects the thyroid. That's a hormone-producing gland in your neck. The thyroid makes hormones that help control many activities in your body. Hashimoto's disease damages your thyroid and keeps it from making enough thyroid hormone for your body's needs. We call that "hypothyroidism."

Hemochromatosis is a condition in which a person's body is overloaded with iron. The extra iron builds up in various organs and can cause health problems. This video discusses the possible causes of hemochromatosis, typical symptoms, and what treatments are available.

This is a disorder of the blood. With it, your blood doesn't clot the way it should. If you get cut or have an internal injury, you can bleed for a long time. That's very dangerous.

This viral infection affects the liver. It's a short-term infection that doesn't cause lasting harm. A vaccine has made hepatitis A infections rare in the United States.

This viral infection affects the liver. It causes the liver to swell, and damages liver cells. You can have a short-term hepatitis B infection that gets better without causing lasting harm. Or, you can have a chronic infection. This may cause permanent liver damage.

This viral infection affects the liver. The virus that causes hepatitis D only infects you if you also have hepatitis B. If you get both infections at the same time, you may get better with no lasting harm. But when you have a chronic hepatitis B infection and then get hepatitis D, this is serious. It may lead to permanent liver damage.

If you or someone you love has been diagnosed with sickle cell disease, you may be facing some unexpected challenges. Here are some things you can do to manage sickle cell disease.

This chronic autoimmune disease results in the immune system attacking the body's own healthy cells. Lupus most commonly affects women age 15-44. It causes tissue damage and inflammation, and can affect any part of the body.

If you're diagnosed with lupus, you may face some unexpected challenges. But lupus doesn't have to take over your life. These tips will help you manage it.

This is a bacterial infection you get from a tick bite. It can spread through your body, causing flu-like symptoms. In some people, it can cause problems that last a long time.

Lyme disease is an illness spread by the bite of an infected tick. A bull's-eye rash is a typical symptom that identifies this illness, which untreated can affect many parts of the body. This video explains how the illness develops and what you can do to protect yourself against tick bites.

This is an inherited blood disorder in which the red blood cells are abnormally shaped. Sickle cell anemia can prevent tissues in the body from receiving enough oxygen. It can cause a wide range of complications.

This disease is a disorder of the blood. With it, the shape of red blood cells becomes distorted. They can clump together and get stuck within small blood vessels. Sickle cell disease can cause problems throughout the body.

This genetic disease causes copper to gradually build up inside your body. Over time, the copper gets to toxic levels. It harms your tissues and organs.

Watch this video to learn about the unique problems sickle cell disease can cause in women.