Memory Quiz To keep your memory sharp, it's helpful to understand factors that affect memory for better or for worse. Migraine Headaches Quiz Many households in the United States have someone who suffers from migraine headaches. Take this quiz to test your knowledge of migraines. Parkinson's Disease Quiz This illness has existed for thousands of years. Learn more about Parkinson's disease by taking this quiz. Cluster Headache Cluster headaches are uncommon, but when they occur, they bring on severe head pain. The pain is constant, focused in and around one eye. This video discusses the possible causes of this type of headache and recommended treatments. Concussion A concussion is an injury to the brain caused by a blow to the head, or by striking the head on another object. It may result in loss of consciousness or confusion, but the effects usually resolve in a few hours or days. This video explains what happens during a concussion, how it should be treated, and what preventive steps to take.