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Fifth disease is a mild viral infection caused by human parvovirus B19. About half of people get fifth disease sometime…

Cat-scratch disease is an infection you can get after a cat scratches, bites, or licks you. It is caused by…

Barrett’s esophagus is a condition that affects your esophagus. It happens when acid from your stomach goes back up into…

Asthma is a chronic (long-term) disease of the lungs. It inflames and narrows the airways, making it harder to…

Allergic conjunctivitis occurs when you’re around things you’re allergic to. These allergens can make your eyes swollen, irritated, and…

Sjögren’s syndrome is an autoimmune disease that causes dry mouth and dry eyes. It can also cause dryness in other…

Restless legs syndrome is a condition in which your legs feel very uncomfortable when you’re sitting or lying down. It…

Acne is a common skin condition. It causes bumps on the skin known as pimples to appear on the face…

Flatulence is another name for gas. It happens when air stays in your abdomen after you eat. It can be…

Premenstrual syndrome (PMS) is the name for a group of symptoms that you may experience up to 14 days before…

Nonalcoholic fatty liver disease (NAFLD) is a buildup of fat in the liver. This common condition can be harmless but…

Nasopharyngeal cancer is a malignant tumor that develops in the nasopharynx, the area where the back part of your nose…

Hemorrhoids are swollen veins in your rectum or anus. The type of hemorrhoid you have depends on where it occurs…

Head lice are small wingless insects that can get on your hair and scalp. Lice bites may cause constant scratching,…

It is normal to shed some hair each day as part of this cycle. However, some people may experience excessive…