Erections that do not last may be related to erectile dysfunction and premature ejaculation due to a variety of reasons, such as psychosomatic factors, physical illnesses or medication. 1. Erectile dysfunction: refers to repeated or persistent inability to maintain or achieve sufficient penile erection without satisfactory sexual life, which can be related to aging, physical illness (such as cardiovascular disease, diabetes, hypertension, etc.) or medication (such as antidepressants, antihypertensive drugs), etc. All of the above risk factors can lead to erectile dysfunction. 2. Premature ejaculation: this means that poor ejaculation control and short ejaculation latency may occur. The cause of premature ejaculation can be related to psychosomatic factors, prostatitis, circumcision and penile head inflammation, or high sensitivity of penile sensation, which can lead to ejaculation within a short period of time after the erection of the penis. The appearance of penile erection can not last, can cause negative impact on the physical and mental, it is recommended to timely to the regular hospital consultation, clear causes, and follow the doctor’s instructions for treatment.