Surgical insertion of catheter bladder after a little urine small belly pain, may be bladder localized injury, cystitis and other factors caused by. 1. Localized bladder injury: improper operation during the insertion of urinary catheter, localized damage to the bladder, a small amount of urine in the bladder, frequent stimulation of the injury site, there will be symptoms of pain in the belly, may also be accompanied by mild hematuria. 2. Cystitis: after inserting a urinary catheter without good daily care, induced infection, such as cystitis, due to the presence of inflammation in the bladder, infection aggravated after the damage to the bladder mucosa, after a little urine in the bladder, there may be a small tummy pain, may also be accompanied by frequent urination, urgency, urinary pain and other symptoms. Surgical insertion of catheters after a little urine bladder belly pain, and lasts a long time, it is recommended to seek medical examination and treatment to avoid causing other complications.