Cystitis does not usually cause pain in the groin area, but the pain caused by cystitis is mainly in the middle of the small abdomen and can be accompanied by abnormal urination, such as frequent urination, urgency, painful urination, or a significant feeling of incomplete urination. If there is pain in the inguinal region, there may be lymphadenitis or spermatorrhea in the abdominal region, and it is recommended that relevant tests, such as ultrasound, be performed to further clarify. In patients with cystitis, the number of white blood cells and bacteria in the urine may be significantly higher during routine urinalysis. In some patients, pain in the lower abdomen can gradually develop into low back pain, which often indicates further progression of cystitis to pyelonephritis, which can cause low back pain. However, the pain is confined to the lower abdomen proper until an upstream infection occurs. It also has a relationship with urine holding and urination. Excessive urine holding or completion of urination can be characterized by excessive expansion of the bladder mucosa or complete contraction of the bladder mucosa, which can then cause increased pain.