This is an unpleasant sensation on the skin, provoking the desire to scratch or rub it. It is common in many types of skin disorders, especially allergic inflammation, and parasitic infestations.

Loose, watery and possibly more-frequent bowel movements are a common problem. This condition may be present alone or be associated with other symptoms, such as nausea, vomiting, abdominal pain or weight loss. Luckily, it is usually short-lived, lasting no more than a few days. But when it lasts beyond a few days into weeks, it usually indicates that there's another problem - such as irritable bowel syndrome or a more serious disorder, including persistent infection, celiac disease or inflammatory bowel disease.

This occurs when the flow of blood to the heart is severely reduced or blocked. The blockage is usually due to a buildup of fat, cholesterol and other substances in the coronary arteries. Fatty, cholesterol-containing deposits, or plaques, can sometimes rupture and form a clot that blocks blood flow. A lack of blood flow can damage or destroy part of the heart muscle.

This is excessive body weight, defined as a body mass index (BMI) of ≥ 30 kg/m2. Diagnosis is based on body mass index. Treatment includes lifestyle modification (e.g., in diet, physical activity, and behavior) and, for certain patients, drugs or bariatric (weight-loss) surgery.