Lap & open appendectomy 3 weeks ago. still feel pain in lower center abdomen when urinates. drain & catheter used. urine test shows no uti. reasons?

Normal: There are a variety of aches and pains that come and go during the recovery period of a traumatic event such as an abdominal operation. These will eventually fade away in the coming 6-8 weeks. May have some residual. Also very common to become fatigued easily for weeks to months, but there is high variability of this. You can always check with your surgeon as well. Hope this helps!