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Disease

Coma

Learn what can cause this state of prolonged loss of consciousness. While a coma rarely lasts longer than a few weeks, some people never wake from one.
Disease

Color blindness

Is it red or is it green? Learn more about what causes this common eye condition and how to tell whether you can distinguish between certain shades of color.
Disease

Eye floaters

Many people over age 50 experience eye floaters. Learn more about this common problem, including causes, other risk factors and treatment options.
Disease

Primary progressive aphasia

Find out more about this type of dementia that affects the speech and language areas of the brain.
Disease

Medication overuse headaches

Using medicines that ease headache pain too often can start causing headaches. Learn about prevention and treatment.
Disease

Tension headache

These common headaches can be triggered by stress. Healthy habits and medicines can help manage them.
Disease

Peripheral neuropathy

Learn what may cause the prickling, tingling or numb sensations of nerve damage and how to prevent and treat this painful disorder.
Disease

Tuberculosis

Learn about the prevention and treatment of this disease that causes serious illness around the world.
Disease

Severe acute respiratory syndrome (SARS)

Learn about this contagious and sometimes fatal respiratory illness. The last known infection was reported in 2004.
Disease

Brain aneurysm

Learn about the symptoms that may occur when a thinning wall of a blood vessel in your brain bulges — and know when to get emergency care.
Disease

Toxic shock syndrome

This rare complication of some types of bacterial infections can be fatal. Learn about symptoms, risk factors and treatment.
Disease

Peritoneal carcinomatosis

This cancer usually starts in another organ and then spreads to the abdominal lining. Learn about symptoms and treatment options, including newer approaches that may offer more hope.

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