Conditons & Treatments

An ICD helps people with serious heart rhythm problems. It sits in the chest, and sends a shock to the heart when it senses an abnormal rhythm. See how it works, and how it saves lives.

Pseudotumor cerebri is a disorder related to high pressure in the brain. It causes signs and symptoms of a brain tumor. It is also called intracranial hypertension.

An IgG deficiency is a health problem in which your body doesn’t make enough Immunoglobulin G (IgG). People with IgG deficiency are more likely to get infections.

Iliotibial band syndrome (often called “IT band syndrome”) is a medical condition that causes pain on the outside of the knee. It mostly commonly happens in athletes, especially distance runners, or those new to exercise.

Immune thrombocytopenic purpura (ITP) is a blood disorder. With this disease, you have a lower amount of platelets than normal in your blood. Platelets are blood cell fragments that help with blood clotting. Having fewer platelets can ...

ITP is a blood disorder that causes a decrease in the number of platelets in the blood. Platelets help stop bleeding. So, a decrease in platelets can result in easy bruising, bleeding gums, and bleeding inside the body. The lower the ...

IgA nephropathy is a chronic kidney disease. It progresses over 10 to 20 years, and can lead to end-stage renal disease. It is caused by deposits of the protein immunoglobulin A (IgA) inside the filters (glomeruli) in the kidney. These ...

Immunoglobulin A (IgA) is a blood protein that's part of your immune system. Your body makes IgA to help fight off sickness. Having an IgA deficiency means that you have low levels or no immunoglobulin A in your bloodstream. 

A buildup of earwax is called impacted earwax. It can cause symptoms such as hearing loss. Impacted earwax is very common. With age, earwax tends to become harder and less mobile. Older adults are more likely to have problems with excess...

Imperforate anus is a problem that your child is born with. It happens when your child has a blocked or missing anus.

Impetigo is an infection of the outer layer of the skin. It's most often caused by the bacteria Staphylococcus aureus. Impetigo is much more common in children, but adults can get it too. It's more common in the summer months.

Impetigo is an infection of the skin. When it affects just the surface, it’s called superficial impetigo. Impetigo can also affect deeper parts of the skin. This is called ecthyma. It may occur on healthy skin. Or it may occur where the ...

Inappropriate sinus tachycardia (IST) is a health problem in which the heart beats very quickly without a good reason. It is a type of heart rhythm abnormality called an arrhythmia.

A brain injury or some other health problem can cause growing pressure inside your skull. This dangerous condition is called increased intracranial pressure (ICP). It can lead to a headache. It can also further injure your brain or ...

Indigestion (dyspepsia) is a pain or burning feeling in your upper belly or abdomen. It is common in adults.

An infant of a mother with diabetes is a baby who is born to a mother with diabetes. Because the mother has diabetes, the baby is at risk for problems.

Infectious esophagitis is swelling and irritation of your esophagus, triggered by an infection.

Infectious mononucleosis is a contagious illness. It’s common in teens and young adults.

Infectious mononucleosis causes swollen lymph glands, fever, sore throat, and chronic fatigue.

Infertility is a problem of the reproductive system. It impairs the body's ability to reproduce. It could be caused by a problem with the man’s system, the woman’s system, or both.

Influenza, or flu, is a respiratory tract infection that spreads easily. It is caused by a virus.

Influenza (flu) is a very contagious viral infection that affects the air passages of the lungs. It causes a high fever, body aches, a cough, and other symptoms.

Each winter, millions of people suffer from influenza—the flu. The flu virus infects the nose, throat, and lungs, and spreads from person to person through coughs and sneezes. The video explains why a flu shot is important to help ...

A hernia is when a part of the intestine pushes through a weak spot in the belly (abdominal) muscles. The hernia creates a soft lump or bulge under the skin.

An inguinal hernia is when part of your intestine pushes through a weak spot in your lower belly (abdominal) wall. This area is called the groin. The hernia creates a lump in your groin. Over time, the hernia may get bigger.

A hernia occurs when a part of the intestine pushes through a weakness in the belly (abdominal) muscles. A hernia in the groin area is called an inguinal hernia.

Detailed information on bee sting and other insect stings, including symptoms and treatment

Insect stings can occur anywhere on the body and can be painful and frightening for a child. Most insect stings cause only minor discomfort. Most stings are from honeybees or yellow jackets, also called ground hornets.

Insomnia is trouble falling to sleep or staying asleep. One in 3 adults has bouts of insomnia.

Tumors on your pancreas, called insulinomas, make extra insulin, more than your body can use. This causes blood sugar levels to drop too low. This can cause symptoms of low blood sugar or hypoglycemia.