Hello,
You have not mentioned your age, but since you are a lady and if you are more than 40 years of age, then hot flashes due to perimenopause need to be ruled out. The other possibility is of hyperhidrosis or excessive sweating
and one of the reasons is thyroid abnormalities. I suggest you to get an evaluation done from a physician.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.