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High-altitude illness can occur when you travel to altitudes higher than 8,000 feet. It happens when your body doesn’t get…

Infant jaundice is common. It can make your baby’s skin, eyes, and mouth turn yellow. While it may look odd,…

Blepharospasm is a rare condition that causes your eyelid to blink or twitch. You can’t control it. It’s caused by…

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…

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…