Health Topics A-Z

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M

Malaria

Diseases and Conditions

Malaria is a serious mosquito-borne infectious disease caused by the bite of female Anopheles mosquitoes. Untreated malaria can progress rapidly to severe disease and death.

Meningitis and Encephalitis

Diseases and Conditions

Meningitis and encephalitis are serious health conditions that cause swelling and irritation in and around the brain. Most but not all are caused by viral infections.

Metabolic dysfunction-associated steatotic liver disease (MASLD) is a liver condition in which too much fat builds up in the liver, but not due to alcohol use.

Migraine

Environmental Health, Diseases and Conditions

Migraine is a condition that is more than just a bad headache. Symptoms of migraine differ from person to person but often include recurring headaches, nausea, vomiting, mood changes, extreme tiredness, and sensitivity to light, noise, and smells.

Multiple Sclerosis (MS)

Diseases and Conditions

Multiple sclerosis (MS) is a chronic neurological disorder affecting the brain, spinal cord, and optic nerve (the nerve connecting the eye to the brain). It is one of the most common disabling neurological diseases affecting young adults.