The main reason for the pain in urination in the eighty year olds is the abnormal condition of the urinary system, which causes the corresponding symptoms, mainly including urinary system inflammation, urinary stones, prostatitis, and urinary system tumors. 1. urinary system inflammation: urinary system inflammation will cause local mucous membrane damage, resulting in abnormal defecation conditions, causing pain and discomfort. 2. urinary stones: urinary stones cause local mucous membrane scratches, in the process of defecation, because of the local stimulation will also cause pain and discomfort in urination. 3. Prostatitis: Prostatitis can lead to pain and discomfort during urination because of the inflammation around it, and it can be accompanied by lower abdominal distension. 4. Urinary system tumor: Urinary system tumor can cause local tissue invasion and destruction, which can also cause related symptoms. If the pain in urination is accompanied by urinary tract obstruction symptoms, you need to consult a doctor in time to observe and carry out standardized treatment under the guidance of the clinician after diagnosing the condition, so as to avoid the delay of the condition.