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Cluster headaches are rare and cause severe pain that tends to recur in the same way each time. Cluster headaches occur in groups, or clusters, and each attack lasts about 1 to 3 hours on average.

Household pets, such as cats and dogs, are the most common sources of animal allergens. Here's what you need to know about symptoms and treatments.

Pollen is the most common cause of hay fever. Read on for more information--and helpful tips for reducing the effects of hay fever during pollen season.

With advances in technology, pacemakers and ICDs generally last several years and, in most cases, allow a person to lead a normal life.

Appendicitis is a medical emergency that happens when your appendix becomes sore, swollen, and diseased.

Find detailed information on the different types of hepatitis, including viral hepatitis, hepatitis A, hepatitis B, and hepatitis C.

Vaginal bleeding and discharge are a normal part of your menstrual cycle. If you notice anything different or unusual, talk with your health care provider.

Poliomyelitis is commonly called polio. It is an infectious disease. It is caused by 3 types of poliovirus. Polio is easily spread from person to person. The poliovirus is a virus that causes paralysis. But most people who are infected with polio have no symptoms and a few have mild symptoms.

To help the orthopedist determine your treatment, you'll need a physical exam, a medical history profile, and a description of symptoms.