The situation of having sweaty underarms is referred to as Axillary Hyperhidrosis. However, now there is no need to worry about this as there are very effective treatments available for this condition.
Firstly, there is the treatment using Anti-perspirants which are creams or sprays applied over the skin. The antiperspirant is applied overnight to the skin to see best results.
Certain oral medicines also work on reducing sweat. But, most of them work only till the time you consume it.
If both antiperspirants and oral medicine do not work, then there is the option of Neuromodulator treatment. In this procedure, small doses of Neuromodulator are injected into your underarm.
Apart from all of the above methods of treatment, we have Microneedle radiofrequency treatment which also is expected to deliver significant results.