Collagenous colitis (CC) is a condition that affects your large intestine. It leads to episodes of watery diarrhea and belly pain.

Lymphocytic colitis is a health problem that causes inflammation of your large intestine. It causes episodes of watery diarrhea and belly pain.

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.

Most adults need 7 to 8 hours of sleep each night. Sleep deprivation means you're not getting enough sleep.

Bicuspid aortic valve is a type of abnormality in the aortic valve in the heart. In bicuspid aortic valve, the valve has only 2 small parts, called leaflets, instead of the normal 3. This condition is present from birth. It often occurs with other heart defects.

In this condition, there is too little amniotic fluid around your baby during pregnancy. It occurs in only about 4% of pregnancies.

A pineal tumor is a tumor of the pineal gland in your brain. This gland secretes a substance called melatonin that affects your sleep-wake cycles. These are very rare tumors. They happen most often to children and adults younger than 40.

Pilocytic astrocytoma (PA) is a slow-growing type of brain tumor. These tumors are often benign or noncancerous. This means that the growth doesn't spread to other parts of the body.

Periodic paralysis (PP) is a rare genetic disorder. It causes sudden attacks of short-term muscle weakness, stiffness, or paralysis. These attacks may affect the whole body or just one or two limbs.

Oculopharyngeal muscular dystrophy (OPMD) is a rare genetic condition. It causes weakness in the muscles around the upper eyelids and part of the throat called the pharynx. The condition may harm vision and cause problems swallowing and talking.