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.

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.

The delicate filtering network in your kidneys can be damaged over time by uncontrolled blood sugar, making it more difficult for your body to remove waste materials. This video explains why it's important to have your urine tested for protein if you have diabetes. It also offers other recommendations to help prevent kidney damage.

Kidney stones are a common problem, affecting about 12 percent of men and 5 percent of women. Stones are typically caused by an imbalance in the urinary system: too little water, too much oxalate, or too much calcium. In this video, you'll find out how the stones develop and what you can do to prevent them.

Migraine headaches are intense, recurrent headaches that may occur at any age but usually begin between the ages of 10 and 30 years. The precise cause is unknown, but it is hereditary in up to 80 percent of cases. This video gives additional details about migraines, including their symptoms and effective treatments.

Pyelonephritis is an infection of the kidney. It usually starts as a urinary tract infection that spreads from the urinary tract to the bladder to the kidney. This video takes a closer look at this serious illness, which can lead to kidney scarring.

The main blood vessels that bring clean blood to your kidneys are called the renal arteries. With age, these arteries can become blocked and may cause high blood pressure. In this video, you'll find out how the blockage develops and what treatments are available to minimize symptoms.

A seizure is caused by abnormal signals in the brain. One type of generalized seizure is the grand mal seizure. A person have this type of seizure may lose consciousness, as well as bowel and bladder control. This video explains what occurs during a grand mal seizure and what treatments are available.

A seizure is caused by abnormal signals in the brain. One type of generalized seizure is the petit mal or absence seizure. A person having this type of seizure has only brief breaks of consciousness that may not be noticed. This video explains how a petit mal seizure occurs and what treatments are available.

A spinal tap, also called lumbar puncture, is used to take a sample of the fluid from the spinal column to look for infection or bleeding. The most common reasons people need this procedure include severe headache, fever with a stiff neck or vomiting, or confusion. Watch this video to learn what happens during this procedure.

Tension headaches are usually dull, aching, or throbbing headaches often associated with sensations of fullness, tightness, or pressure. The pain involves both sides of the head and neck. In this video, you'll find out more about symptoms, possible causes, and recommended treatments.