Everybody sweats in their underarm area, which is why deodorant was invented in the first place. It's when deodorant fails to do the trick or doesn't stop the embarrassing wetness that often comes with underarm sweating that problems begin to occur. Consider some of the more natural approaches to stopping armpit sweating before you resort to more drastic measures.
Loose Cotton Clothing
While your choice in clothing cannot stop you from sweating, it can stop you from sweating in a way that people notice. Tight clothing that conforms to your body and sticks to you under the arms can cause you to sweat more and makes the moisture more noticeable. Always apply antiperspirant and opt for loose fitting cotton shirts on hot days.
Apple Cider Vinegar
Apple cider vinegar has also been used as a natural way to stop sweating under the arms. Malt vinegar is known to lower the pH of the underarm area, making it difficult for bacteria to thrive. Apply it at night, and wash it off in the morning. After showering, apply regular deodorant as usual.
If commercial deodorant doesn't seem to be doing the trick for you, try making a homemade deodorant out of baking soda and apply it to your underarms. Mix a spoonful of baking soda with some warm water and spray in some vanilla or lavender essential oils to sweeten the scent. Put the solution in a water bottle and spray it on with your regular deodorant every day.
If your sweating problem is becoming so embarrassing that it's causing stains on your clothing, apply your deodorant as usual and dab a little talcum powder to the area. Put your shirt on carefully so as not to leave telltale marks on your shirt. The talcum powder should absorb some of the moisture and discourage excessive sweating under your arms.