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.

Vasovagal syncope is a condition that leads to fainting in some people. It's the most common cause of fainting and is usually thought of as benign.

A "turf toe" is a sprain of the largest joint of your big toe. It happens when your toe forcibly bends upwards, such as when you push off into a sprint.

Thoracic outlet syndrome is a squeezing of nerves or blood vessels between the collarbone and first rib. Symptoms: arm pain, tingling, swelling, or color or temperature changes, often worse with overhead use. Most improve with physical therapy. Seek urgent care if an arm is cool, pale, or swollen.

Obstructive sleep apnea occurs when your breathing stops briefly during sleep. This can occur when something is blocking your airway. The stopped breathing can occur many times a night causing snoring, and daytime fatigue.

Takotsubo cardiomyopathy (TCM) is a type of heart condition. It causes sudden chest pain. The symptoms of TCM can look like a heart attack.

Takayasu's arteritis is an autoimmune disease. It causes inflammation of the large arteries. It's a rare disease that's most common in women and people of Asian descent.

A subdural hematoma is a buildup of blood on the surface of the brain. Read on for details about this condition, including causes, who's at risk, symptoms, diagnosis, and treatment.

A subconjunctival hemorrhage is when a blood vessel breaks open in the white of the eye. It causes a bright red patch in the white of the eye.