Breaking a sweat is usually associated with a good workout. But if you're 40 or older and you notice your sheets are drenched when you wake up, or your palms are always sweaty, you could have an underlying medical condition.

Yes, you could also be entering perimenopause, as women can start to experience such hot flash-inducing hormonal fluctuations anytime in their 40s. The changes that cause night sweats often last between 4 and 8 years.

"All night sweats are not hormonal," though, stresses Dr Lauren Streicher. "There are other reasons why women have unpredictable or inappropriate sweating."

If your perspiration patterns have changed, Streicher recommends you check in with your doctor to see what's going on. One of these 6 things could explain the sudden onset of excessive sweating: