The weakness of waist and knees, impotence and premature ejaculation, low sexual function, may be related to heavy work, bad habits, prostatitis, we recommend that the patient to consult a doctor to confirm the diagnosis. 1. heavy work: if the patient recently heavy work, do not get a good rest conditioning, physical exertion is larger, brain fatigue, may induce the above situation. It is recommended to take care of yourself, pay attention to rest, and relieve both physical and mental fatigue. 2. Bad habits: If the patient has indulgence, frequent masturbation, smoking, alcoholism, staying up late and other bad habits, it may also lead to a decrease in the body’s function, similar symptoms. It is recommended that patients maintain a regular routine, quit smoking and drinking, avoid indulgence, reduce the burden on the body, and promote the symptoms to subside. 3. Prostatitis: If the patient has prostatitis, it may also lead to the above symptoms, and there may be pain in the perineal area. It may be accompanied by symptoms of urinary tract irritation such as frequent urination, urgency, and painful urination. To summarize, if the above symptoms exist, you should consult a doctor in time.