Penile erection all night, indicating the existence of abnormal penile erection, may be neurological factors, tumors, pelvic infection, trauma and other factors. 1. Neurological factors: for example, traumatic brain injury, brain tumor epilepsy, eclampsia, etc., may affect the erectile center of the nervous system, it is easy to induce abnormal erection of the penis, resulting in the presence of erection of the penis at night. 2. Tumor: for example, prostate cancer, bladder cancer, penile cancer, etc. After the lesion is aggravated, it may compress the blood vessels and hinder the venous return of the penis, which may lead to abnormal erection. 3. Pelvic infection: when there is pelvic infection, it may lead to the compression of blood vessels and nerve bundles, which may cause ischemic penile abnormal erection, and then the penis will be erect all night. 4. trauma: for example, the lower body suffered trauma, the penis small arteries or some blood vessels to cause direct damage, will induce abnormal erection. There are many other causes of penile erection at night, it is recommended to consult a doctor for examination and treatment to avoid adverse effects.