Catheter ablation can fix a cardiac arrhythmia when medicines used to treat it don’t work. The ablation stops abnormal electrical signals in your heart. This lets your normal heart rhythm take over again.

Celiac disease is a digestive problem that hurts your small intestine. It stops your body from taking in nutrients from food. You may have celiac disease if you are sensitive to gluten.

Cellulitis is a serious deep infection of the skin caused by bacteria. It usually occurs in an area that has already had an injury or skin break.

Cellulitis is a spreading skin infection. It may affect the upper skin layer. Or it may affect the deeper skin and layer of fat under the skin. When cellulitis affects the upper skin layer, it may be called erysipelas. This type of ...

Cellulitis is a serious type of infection and inflammation. It can occur in various parts of the body. When it occurs in the eyelid and tissues in the front part of the eye area, it’s called pre-septal cellulitis. When it occurs behind ...

When one of the vessels that carry blood to your eye's retina gets blocked, it can cause you to lose your eyesight. This problem often happens suddenly and without any pain. This is called a central retinal artery occlusion (CRAO).

A cerebral abscess can cause your brain to swell, putting harmful pressure on brain tissue. An abscess can also keep blood from flowing to parts of your brain. If you develop this problem, you will need emergency treatment.

A cerebral aneurysm (also called an intracranial aneurysm or brain aneurysm) is a bulging, weakened area in the wall of an artery in the brain, resulting in an abnormal ballooning of the artery that is at risk for rupturing.

Cerebral palsy (CP) is a lifelong condition that affects how the brain and muscles communicate. CP affects body movement, muscle control, coordination, reflexes, posture, and balance.

Cerebral venous sinus thrombosis (CVST) occurs when a blood clot forms in the brain's venous sinuses. This prevents blood from draining out of the brain. As a result, blood cells may break and leak blood into the brain tissues, forming a...

Cerebrospinal fluid (CSF) leak occurs when there is a tear or hole in the membranes surrounding the brain or spinal cord, allowing the clear fluid that surrounds and cushions those organs to escape. Many CSF leaks heal on their own, but ...

Cervical arthritis means arthritis of the neck bones. Your neck has 7 vertebrae, and cushiony disks sit between the vertebrae. Over time or with injury, the disks can have problems and may bulge outward or get thinner.

Cervical cancer is cancer that starts in the cervix. Learn more about symptoms, diagnosis, and treatments.

The vertebrae in your spine are cushioned by soft disks. When one of the disks in your neck—the cervical area of your spine—ruptures, the result can be neck pain. Watch this video to find out the possible causes and recommended treatment.

The cervical spine refers to the seven spinal bones (vertebrae) in the neck. It supports the head and connects to the thoracic spine.

Cervicitis is irritation or infection of the cervix. It can be caused by a number of different sexually transmitted diseases.

Chagas disease is caused by a parasite. It is transmitted to people through the feces of insects. It is common in South and Central America and Mexico.

A chalazion (kuh-LAY-zee-un) is a slow-growing, painless lump in the eyelid that forms because of the swelling of an oil gland. It’s more common in adults between ages 30 and 50 than in children.

Charcot-Marie-Tooth disease is an inherited nerve defect that causes abnormalities in the nerves that supply your feet, legs, hands, and arms.

Chemical burns happen when a chemical gets into your child’s eye.

Hair loss is a common side effect of chemotherapy. It can affect the hair on the head, and also the eyebrows, eyelashes, and facial and pubic hair. Not all chemotherapy causes hair loss. And not all children lose hair in the same way.

Chemotherapy is the use of medicines to treat cancer. The medicines can cause an inflammation of the lining of the mouth. The mouth is lined with mucous membranes. When these are inflamed, it’s called mouth mucositis.

A Chiari malformation (CM) is a problem with how the brain sits in the skull. The brain normally sits fully inside the skull. With a Chiari malformation, the lower part of the brain (cerebellum) dips down through a normal opening ...

Chickenpox is a common childhood disease that causes an itchy, blistering rash and is easily spread to others.

Childhood apraxia of speech is a type of speech disorder. It is present from birth. A child with this condition has problems making sounds correctly and consistently. Apraxia is a problem with the motor coordination of speech.

Cholangitis is a redness and swelling (inflammation) of the bile duct system. In most cases cholangitis is caused by a bacterial infection. The infection often happens suddenly. But in some cases it may be long-term (chronic).

Cholecystitis is a redness and swelling (inflammation) of the gallbladder. It happens when a digestive juice called bile gets trapped in your gallbladder.

Cholera is an infectious disease caused by bacteria.

Cholestasis of pregnancy is a liver problem. It slows or stops the normal flow of bile from the gallbladder. This causes itching and yellowing of your skin, eyes, and mucous membranes (jaundice). Cholestasis sometimes starts in early ...

A chondroblastoma is a rare type of noncancerous bone tumor that begins in cartilage. This is the specialized, gristly connective tissue from which most bones develop. It plays an important role in the growth process. There are many ...