Fast ejaculation refers to premature ejaculation, which is mainly considered to be related to psycho-psychological factors and biological factors. 1. Mental psychological factors: sexual abuse, unpleasant sexual experiences, excessive stress, tension, anxiety, or emotional disharmony with the partner, poor living environment, can trigger premature ejaculation. 2. Biological factors: (1) Genetic factors: According to research findings, premature ejaculation has genetic susceptibility. Therefore, heredity may also be an important cause of premature ejaculation. (2) Diseases of the reproductive system: such as prostatitis, glans inflammation, seminal vesicle adenitis and other diseases, can also cause premature ejaculation. (3) Other causes: abnormal hormone levels, neurotransmitter abnormalities, etc., can also trigger premature ejaculation. The causes of premature ejaculation are complex and may be related to other factors. It is recommended that patients seek medical examination as soon as possible for targeted treatment.