Always wanting to pee before going to bed may be caused by physiological factors such as drinking too much water or eating foods with high water content, or it may be caused by other reasons such as cystitis, urethritis, and overactive bladder syndrome. 1. Physiological factors: Drinking too much water before going to bed or eating watermelon and other foods with high water content may make you always want to urinate before going to bed. This is a normal physiological phenomenon and does not require treatment. 2. Cystitis: Cystitis may be caused by bacterial infection, foreign body in the bladder, use of chemotherapeutic drugs and other reasons. Patients will have frequent urination, urinary urgency, urinary pain, burning sensation in the urethra and other manifestations, so patients will have the symptom of always wanting to urinate before going to bed. 3. Urethritis: Urethritis is considered to be caused by gonococcus, Mycoplasma trachomatis, Mycoplasma urealyticum and other pathogens. Patients will show frequent urination, painful urination, urethral itching, etc., so patients will always want to urinate before going to bed. 4. Other: patients always want to urinate before going to bed is also considered to be overactive bladder disease, neurogenic urinary frequency and other causes. For the exclusion of physiological factors caused by always wanting to urinate before going to bed, the patient needs to consult a doctor in a timely manner, need to choose the appropriate measures for treatment under the guidance of the doctor.