What is the cause of Teresa Teng's suicide?

1On May 8th, 995, Teresa Teng died in Chiang Mai, Thailand at the age of 42. It is reported that she died of asthma, but there are rumors that Teresa Teng had palm prints on her face before she died. But because her foreign boyfriend Paul asked for the integrity of the body, there was no autopsy at that time, and the real cause of death of a generation of singers is still a mystery!