Sweating underarms is often a sign of hormonal or medical conditions. It may be due to excessive levels of female hormones, such as estrogen and progesterone, in the blood. Hormonal changes can also happen with puberty in girls and young women. Or it could be caused by an adrenal gland tumor (a noncancerous tumor that grows on one side of the adrenal gland). Sweating can also occur when there are too few numbers of sweat glands in the armpit area. A condition called hyperhidrosis usually causes sweating under arms but it’s not always present at birth. If you have hyperhidrosis, your doctor will likely advise you to use anti-perspirant deodorants every day even if they make you feel uncomfortable because they reduce sweating enough for some people to keep their underarm skin dry all day long without antiperspirants causing problems for others who get bothered by their smell or consistency.
Some people get very embarrassed about having sweaty armpits so they avoid wearing tight clothes that show them off even though these are probably what makes them sweat more! The best thing is to talk openly with your doctor about what might cause this embarrassing problem so you can address it properly instead of waiting until someone tells you how unattractive it looks while trying not to worry about being judged on your appearance during normal activities like walking down a street or getting dressed up for social occasions.