Serotonin syndrome (aka serotonin toxicity) is often misunderstood, causing both unnecessary worry and missed warning signs.

Alpha-gal syndrome is a strange tick-borne illness that induces an allergy to a specific type of sugar found in red meat.

Havana syndrome is a mysterious ailment that began afflicting U.S. diplomats and intelligence officers in or near the U.S.

In the years leading up to his death Tuesday, former CIA Director James Woolsey suffered from the mysterious ailment known as ...

There’s a type of food allergy you might not expect because it doesn’t come from foods like peanuts, dairy, wheat or soy -- ...

Four counties have 52% of Florida's new leprosy cases. They're all located along I-4, home to the nine-banded armadillo. It's ...

Many people develop symptoms days to months before a heart attack. Chest pain is the most common prodromal symptom, but other warning signs include chest heaviness, heart palpitations, shortness of ...