Unconscious erection may belong to the normal physiological phenomenon, or it may be caused by pathological reasons, such as long foreskin, high sensitivity of the glans, prostatitis, etc.. 1. Physiological phenomenon: involuntary erection is related to sexual impulse and sexual excitement, which indicates normal male sexual function. 2. Hyperemesis gravidarum: The foreskin grows with the penis and is closely connected to the head of the penis, playing a role in protecting the head of the penis. The phimosis leads to increased sensitivity to friction and stimulation of the penis, resulting in an easy erection of the penis. 3. high sensitivity of the glans: there are a large number of sensory nerve fibers at the nerve endings of the glans, which are unusually sensitive to all kinds of friction stimuli, resulting in an abnormal reflex arc, causing involuntary erection. 4. Prostatitis: embolization of the prostatic venous plexus due to inflammation may impede the return of deep veins and cause abnormal penile erection. If the erection symptoms are not caused by physiological factors, you should consult a doctor in time and avoid self-medication to avoid delaying the condition.