Health Topics A-Z

Narcolepsy is a chronic neurological disorder that affects the brain’s ability to control sleep-wake cycles. People living with narcolepsy can fall asleep without warning during daily activities such as eating, working, or driving.

Obsessive-compulsive disorder (OCD) is a mental illness in which a person experiences uncontrollable, recurring, and often distressing thoughts (obsessions), engages in repetitive and excessive behaviors (compulsions), or both. 

Osteoarthritis is the most common type of arthritis. It is one of the leading causes of physical disability in adults.

Osteoporosis is a bone disease that weakens bones and makes them more likely to break.

Pancreatic cancer can develop from two kinds of cells in the pancreas: exocrine cells and neuroendocrine cells, such as islet cells. The exocrine type is more common and is usually found at an advanced stage. Pancreatic neuroendocrine tumors are less common but have a better prognosis.

Pelvic floor disorders occur when the muscles or connective tissues of the pelvic area weaken or are injured, affecting the bladder, bowel, and pelvic organs.

Pneumonia is an infection that affects one or both lungs. Bacteria, viruses, and fungi can cause pneumonia.

Polycystic ovary syndrome (PCOS), also known as polyendocrine metabolic ovary syndrome (PMOS), is a group of symptoms caused by a hormonal imbalance. The symptoms affect metabolism, the menstrual cycle, reproductive health, heart and blood function, inflammatory responses, and other characteristics. 

Post-traumatic stress disorder (PTSD) is a mental illness that some people develop after experiencing or witnessing a traumatic or life-threatening event.

Prostate cancer is the second most common cancer in men after skin cancer and the second leading cause of cancer death among men in the United States. Prostate cancer usually grows very slowly, and finding and treating it before symptoms occur may not improve men's health or help them live longer.