A cough that lasts for weeks could be caused by smoking, postnasal drip, asthma, acid reflux, respiratory infections, COPD or another underlying problem.
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.