Hi Hello Dr. Matthew I'm Male At The Age Of

Hi Hello Dr. Matthew I'm male at the age of 33 my weight is 90Kg, and my height is 1.83M. A friend of mine brought me sauna belt this week. Would you give me any suggestions on the use of this in case it can bring me any harmful side effects? I'm now feeling bit burning inside after my first two days use of each 45 minutes duration