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What is an ear infection? An ear infection is one of the most common conditions among children. It is caused by a viral or bacterial infection. These infections create pressure in the Eustachi...

What is high cholesterol? Cholesterol is a type of fat that your body needs to build cells and make certain hormones. Your body makes cholesterol naturally, and you also get it from food. High chol...

What is chronic kidney disease (CKD)? Chronic kidney disease (CKD) occurs from progressive damage to your kidneys. The damage occurs slowly, over time. Normal, healthy kidneys remove waste and extr...

What is cirrhosis and portal hypertension? Cirrhosis is a type of liver disease that happens when healthy liver cells are damaged and replaced by scar tissue. This scar tissue makes it harder for b...

What is autism? Autism is a neurological condition that’s characterized by social communication challenges and repetitive behaviors. Also called autism spectrum disorder (ASD), autism varies in sev...

What is a corneal abrasion? A corneal abrasion is a type of eye injury that involves a cut or scratch on your cornea. The cornea is a clear layer of protective tissue at the front of your eye that ...

What is allergic rhinitis? Allergic rhinitis is the medical term for hay fever or nasal allergies. By definition, allergic rhinitis is swelling of the nasal passages caused by allergens. It is ofte...

What is alopecia areata? Alopecia areata is a form of alopecia (hair loss). It’s a non-life-threatening disease of your immune system that affects the hair on your scalp. With this condition, your ...

What is C. diff.? Clostridioides difficile (C. diff.) is a type of bacteria that can live in the intestines without causing problems. It also lives in the environment, such as soil, water, and anim...

What is cancer? Cancer is a collection of many diseases that all involve the growth of abnormal cells. The body is made up of many types of cells. Normally, cells grow, divide, and then die. Someti...