Science News

400,000 Americans have MS

'The kissing disease' also spreads through shared utensils and coughing and sneezing.

Melanoma is a type of skin cancer that begins in the skin's pigment-producing cells, called melanocytes. These cells make melanin, which is responsible for the color in skin, eyes and hair.

Symtpoms, causes and treatments for macular degeneration.

Lyme disease is a bacterial infection caused by the bite of a tick. Early symptoms include a bull's-eye rash.

Lupus is a chronic disorder in which the immune system attacks otherwise healthy cells. It is characterized by fatigue, joint pain and rashes.

Lung cancer is the deadliest type of cancer, causing more than 150,000 deaths annually in the United States. Smoking is the No. 1 cause of lung cancer.

Liver cancer is cancer that begins in the tissues of the liver, though it may also result from cancer spreading to the liver from other parts of the body.

Leukemia is cancer of the white blood cells. It is the most common type of cancer in children, but more adults get diagnosed with leukemia.

Lactose intolerance is not the same as milk allergy

Abdominal pain, bloating and gas all symptoms of IBS

Insulin resistance is a condition where the body's cells don't properly respond to the hormone insulin, which tells cells to take in blood sugar and use it for fuel.

Insomnia is a sleep disorder characterized by difficulties falling or staying asleep, even though people have the chance for adequate sleep.

High blood pressure is a serious disease that can, over time, damage the blood vessel walls and increase a person's risk of heart attack, stroke and other conditions.

Gestational diabetes is a type of diabetes that develops, or is first diagnosed, during pregnancy. The condition, like other forms of diabetes, involves high blood sugar levels.

Hepatitis is the inflammation of the liver, which is most often caused by a viral infection.

About 2 million Americans are treated for hemorrhoids each year.

Heart disease, or cardiovascular disease, encompasses a range of conditions. The root of heart disease is when that blood flow is blocked.

It may take more than a month for symptoms of head lice to show.

Hair loss is typically considered the domain of aging men, but this equal-opportunity condition -- which has many causes -- can affect virtually anyone.

Also called 'gouty arthritis,' gout is a painful form of arthritis caused by too much uric acid in the blood. Learn about causes, symptoms and treatment.

Acid reflux disease, also called gastroesophageal reflux disease (GERD), is a chronic condition that occurs when stomach contents wash up into the throat.