Penile erection all the time may be a normal physiological phenomenon, but if the penile erection is not related to sexual stimulation and lasts more than 4h, it is abnormal erection. 1. Physiological phenomenon: Penile erection all the time is common in adolescent males. Mainly due to the maturity of sexual function and lack of sexual life, such as a little sexual stimulation, sexual excitement, the penis will be frequently erected, but will soon be weak, is a normal physiological phenomenon. Generally after regular ejaculation, it can be significantly reduced. 2. Pathological state: Penile erection all the time, if it is not related to sexual stimulation or sexual desire and lasts for more than 4h, it is usually abnormal penile erection. It may be related to tumors, penile trauma, etc. It is manifested by the filling and tension of the cavernous body of the penis, and may also be manifested by pain and difficulty in urination. Men who have erections all the time may have other causes, and it is recommended to actively seek medical treatment under the guidance of a professional physician.