Cerebral Autosomal-Dominant Arteriopathy with Subcortical Infarcts and Leukoencephalopathy (CADASIL) and Cerebral Autosomal-Recessive Arteriopathy with Subcortical Infarcts and Leukoencephalopathy (CARASIL) are extremely rare genetic ...

The calcaneus is the large bone at the heel of the foot. It is usually fractured after a fall from a great height or in a motor vehicle accident.

Calluses and corns are thickened areas of skin caused by rubbing (friction) or pressure. The outer layer of skin thickens to protect the bone under the skin with extra padding. Calluses most often occur on feet and hands. Corns are a ...

Campylobacter infection is a mild to serious digestive illness. It is caused by bacteria. Symptoms often include cramping, diarrhea, belly pain, and fever.

Thrush is a type of fungal infection. It occurs in your mouth and throat. Thrush does not usually affect healthy adults. It is more common in people with impaired immune systems. It is also more likely in those who take certain kinds of ...

Candidiasis is an infection caused by yeast called Candida. Candida normally causes no harm, and is found on the skin, vaginal area, and digestive system. But in some cases, it can overgrow. This can cause a rash, itching, and other ...

Canker sores are small sores inside the mouth. They are often found inside the lips, on the cheeks, or on the tongue.

Cannabinoid hyperemesis syndrome (CHS) is a condition that leads to repeated and severe bouts of vomiting. It results from long-term use of marijuana).

Carbapenem-resistant Enterobacteriaceae (CRE) are a type of bacteria. They can cause infections. These infections can be hard to treat.

Carbon monoxide poisoning is a life-threatening emergency. It occurs when carbon monoxide (CO) fumes are inhaled.

Carbon monoxide poisoning is an illness that occurs from breathing in carbon monoxide (CO) gas. It is a medical emergency and needs treatment right away.

Carcinoid tumor is a rare type of tumor that grows slowly.

In carcinoma of unknown primary (CUP), doctors can’t tell where the cancer started. CUP has already spread by the time it’s diagnosed. Learn more about symptoms, diagnosis, and treatments.

Cardiac catheterization procedure can diagnose a variety of heart conditions and determine the health of your coronary arteries, heart valves, and heart muscle. View this video to learn what happens during this procedure and various ...

If you have a heart condition, your healthcare provider may recommend a cardiac rehab program to help you recover. This video tells you more about cardiac rehab and how it can help.

Cardiac sarcoma is a rare type of cancerous tumor that occurs in the heart.

An exercise cardiac stress test can help your healthcare provider find out if you have coronary artery disease (CAD). It can also show how hard you can safely exercise.

An exercise imaging stress test shows how well blood flows inside your heart and how well your heart pumps blood. It gives your healthcare provider more information than a non-imaging stress test.

Cardiac tamponade happens when extra fluid builds up in the space around the heart. This fluid puts pressure on the heart and prevents it from pumping well.

Tumors that originate in the heart are rare, but can be either benign or malignant. Because the heart is such an essential organ, even benign tumors can be life-threatening.

A sprain is a tear in a ligament that happens when it’s stretched too hard. A sprain is treated with a sling, elastic bandage, splint, or cast.

Carnitine is a natural substance that the body uses to process fats and produce energy. Carnitine deficiency is when not enough of the nutrient carnitine is available to cells in the body. This can cause muscle weakness and heart or ...

Carnitine is a natural substance that the body uses to process fats and produce energy. Carnitine deficiency is when not enough of the nutrient carnitine is available to cells in the body. This can cause muscle weakness and heart or ...

Carnitine palmitoyltransferase (CPT) deficiency is a very rare condition that causes muscle weakness and other symptoms. It happens because of a problem with 1 of 2 enzymes, CPT1 or CPT2. Enzymes are substances in the body that help ...

Carotid artery disease means that a large blood vessel in your neck is partly blocked. You may not have symptoms. But the condition is serious because it can lead to a stroke.

Carotid artery disease causes a narrowing of the major blood vessels that supply the brain. It is caused by atherosclerosis and can lead to a stroke.

When an abnormal connection happens between either of the carotid arteries and the veins just behind the eye, it is called a carotid cavernous fistula. Because the carotid arteries have a greater pressure of blood flow than do the veins,...

A carotid dissection is a type of tear in one of your carotid arteries. It is a common cause of stroke in people younger than age 50.

Carotid stenosis, also known as carotid artery disease, is a narrowing of a carotid artery. The narrowing is caused by plaque or fatty deposits along the inner wall of the artery resulting in reduced blood flow to the brain and, in some ...

Women develop carpal tunnel syndrome three times more frequently than men. It usually occurs only in adults.