Millions of Americans are under a sweltering heat dome as record high temperatures blast much of the eastern United States. But for some, the effects of triple-digit heat are worse than others.

DEAR DOCTOR K: I sweat a lot, particularly on my forehead, when I get nervous. This is especially true when I'm about to meet new people. It's very embarrassing. Any suggestions? DEAR READER: Sweating ...

Although sweating is a normal physiological reaction, excessive sweating is sometimes explained by a little-known disorder called hyperhidrosis. In the sun, or following intense physical effort, ...