Can not carry out cystoscopy: urinary tract infection, coagulation function abnormalities and female patients in menstruation. 1. Urinary tract infection: patients with urinary tract infection can not carry out cystoscopy, this is because cystoscopy is an invasive invasive operation, which will make the local serious, aggravate the patient’s condition, so patients with urinary tract infection should not carry out cystoscopy. 2. Patients with abnormal coagulation function: if patients with abnormal coagulation function undergo cystoscopy, if the urethral mucosa of the patient is damaged during the examination, it will cause more than just bleeding from the urethral mucosa, so cystoscopy should not be carried out in this case. 3. Female patients can’t have cystoscopy if they are menstruating, because menstrual blood can cause cystoscopy contamination. If the patient has any discomfort, go to the hospital in time, do not be careless, so as not to delay the treatment.