Subconjunctival hemorrhage is a broken blood vessel in the eye — learn more about this common, harmless condition that clears up without treatment.

Often caused by smoking, this lung disease causes problems with breathing that worsen over time. It's one type of chronic obstructive pulmonary disease (COPD).

Learn about this rare but serious condition of the adrenal glands that's treated by replacing hormones the body needs.

Learn what may cause this change in mental abilities. Symptoms develop fast and include confusion and being unaware of surroundings.

This heart rhythm disorder causes slow, paused or irregular heartbeats. Learn the symptoms and how it's treated.

Learn how to spot the symptoms and how doctors treat this group of peripheral nerve disorders.

In this serious eating disorder, people lose control and eat large amounts of food. Then they get rid of it in unhealthy ways by purging, such as vomiting.

Learn more about this sleep condition that causes periods of involuntary sleep, sleep paralysis and early rapid eye movement (REM) sleep.

This common condition can cause pain and mobility issues, making simple tasks difficult. Treatment may include medications, splints and sometimes surgery.

Learn about this condition that causes uncontrollable shaking and find out how it differs from Parkinson's disease.

This noncancerous tumor can sometimes grow on the nerve in the head that affects hearing and balance.

This mental health condition, which is caused by being part of or witnessing a terrifying event, leads to symptoms that include flashbacks, nightmares and severe anxiety.

An excess of growth hormone causes the bones to keep growing, which can lead to a number of serious complications if left untreated.

Learn about the types of tumors that make up this group of rare cancers. Find out about symptoms, causes, diagnosis and treatments.

In this condition, the muscles in the esophagus don't relax, preventing food and drink from moving into the stomach. Learn more about this rare digestive disorder.

Uncomfortable sensations in your legs can interrupt your sleep — making you drag through your day. These therapies calm the restlessness and improve sleep.

Understand what happens when your thyroid is underactive and learn about treatment for this condition.

This joint pain is triggered by an infection in another part of the body — often the intestines, genitals or urinary tract.

This rare blood vessel disease may cause breathing trouble, face pain and a persistent runny nose. Medications can help.

Understand what happens when your thyroid is overactive and learn about treatment for this condition.