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How and when you feel sleepy has to do with your sleep/wake cycles. These cycles are set off by chemicals in the brain.

A detailed look at dyssomnia sleep disorders. These sleep disorders are caused by another health problem.

After gastric bypass surgery for weight loss, the new connection between the stomach pouch and the small intestine may narrow. This is called an anastomotic stenosis. It’s also known as a stricture.

Polyps are small growths of tissue that can form in the body. If they grow on the lining of the uterus (endometrium), they are called endometrial polyps. Cervical polyps grow in the cervical canal.

Monkeypox is an illness caused by a virus. It can cause fever, swollen lymph nodes, body aches, and a rash with blisters that hurt.

A subarachnoid hemorrhage means that there is bleeding in the space that surrounds the brain. Most often, it occurs when a weakened area in a blood vessel (aneurysm) on the surface of the brain bursts and leaks. The blood then builds up around the brain and inside the skull increasing pressure on the brain. This can cause brain cell damage, life-long complications, and disabilities.

Acute bacterial rhinosinusitis (ABRS) is an infection of both your nasal cavity and sinuses. It's caused by bacteria. Here's what you need to know about this condition.

A joint dislocation is when there is an abnormal separation between the bones of a joint. When this happens in your ankle joint, it's known as an ankle dislocation. It is a severe injury.

Post-polio syndrome (PPS) is a disorder of the nerves and muscles that happens in some people many years after they have had polio. PPS may cause new muscle weakness that gets worse over time, pain in the muscles and joints, and tiredness.