After a heart transplant, the immune system can see the new heart as a foreign object and start to attack it. This is called transplant rejection. Learn more about transplant rejection, including causes, risks, symptoms, diagnosis, treatment, and prevention.

Glioblastoma multiforme (GBM) is the most common brain tumor in adults. Treatment is aggressive and involves surgery, radiation, and chemotherapy.

Ehrlichiosis is an illness caused by bacteria that’s spread by ticks. The illness causes fever, muscle aches, and other symptoms. Read on to learn more information.

Ectropion is a sagging or outward turning of an eyelid. It usually affects a lower eyelid. It often affects both lower eyelids. But in some cases it only affects one side.

Pressure differences between the inside of the ear and the outside of the ear can cause ear barotrauma or ear damage. It can cause pain and sometimes permanent hearing loss. It can be caused by scuba diving, air travel, or exposure to an explosion.

Cushing syndrome is a hormonal disorder. It’s caused when you have high levels of the hormone cortisol over a long time. Cushing's syndrome is fairly rare. It most often affects adults who are 20 to 50 years old. It is sometimes called hypercortisolism.

A tumor forms when an abnormal cell grows to form a mass of abnormal cells. Spinal cord tumors are tumors that form on the spinal cord or in the area around it.

A corneal ulcer is an open sore on your cornea. It's often caused by an infection.

Convergence insufficiency (CI) is when the eyes have trouble working together while focusing on an object at that is close by.

Digital eye strain is a group of eye and vision problems related to extended computer use.