The white film-like substance inside the male urethra may be due to physiological reasons or pathological reasons, such as foreskin scale, gonococcal urethritis, fungal infections and so on. 1. Physiological reasons: male circumcision, phimosis, etc.. If the daily cleaning is not in place, it can cause the accumulation of foreskin scale and patchy white secretion at the urethra, which is manifested as a white film at the urethra. 2. Pathologic causes: (1) Urethritis: if it is mycoplasma, chlamydia, gonococcal infection, it may lead to urethritis. The urethra is stimulated by inflammation, resulting in increased urethral secretion and a white film-like substance at the urethra. Some patients may also have symptoms of painful and frequent urination. (2) Fungal infection: If the patient has a fungal infection at the urethra due to the use of invasive catheter urethra and low immunity, it may also be due to the proliferation of local fungi. It can cause a white film-like substance to appear at the urethral opening, accompanied by frequent urination, urinary urgency or urinary itching. There may be other reasons for the white film-like substance inside the male urethra, and the patient needs to consult a doctor for timely examination and early treatment.