Left bundle branch block is a problem with the heart’s electrical wiring (conduction) system. Read on for details about this condition.

Labyrinthitis is the inflammation of part of the inner ear called the labyrinth. The inflammation causes vertigo, hearing loss, and other symptoms.

Multiple sclerosis (MS) is a disease that interferes with your brain's ability to operate your body.

Knee pain is very common, especially in highly active people who put a lot of pressure on their knees, such as runners. Read on to learn more about this condition.

Keratoconus is an eye disorder in which your cornea slowly thins over time. The cornea also bulges out over time, to form a cone-like shape. Keratoconus causes nearsightedness (myopia) and blurry vision.

Iritis is the inflammation of your iris and the anterior chamber of your eye. Iritis can lead to serious problems. It can cause severe vision loss and even blindness.

Impetigo is an infection of the outer layer of the skin. It's most often caused by certain bacteria. Impetigo is much more common in children, but adults can get it too. Learn details about causes, symptoms, and treatment.

A buildup of earwax is called impacted earwax. It can cause symptoms, such as hearing loss. Impacted earwax is very common. With age, earwax tends to become harder and less mobile. Older adults are more likely to have problems with excess earwax.

Iliotibial band syndrome (often called IT band syndrome) is a health problem that causes pain on the outside of the knee. It mostly commonly happens in athletes, especially distance runners, or those new to exercise. Read on to learn more.

Hypertrophic cardiomyopathy (HCM) is a disease that causes thickening (hypertrophy) of the heart muscle. The heart cells enlarge more than they should, and scarring is often found between the cells.