<s>[INST] I just had kidney stone surgery and they did not locate the stone. They believe I passed it prior to the surgery. I have had this same surgery two other times with no side effects. This time I am in extreme pain and it has been 4 days. My doctor said it is normal, however I have never felt like this in the past. I still have pain in my back and abdomen . Any suggestions as to why I feel like this? [/INST] Hi Welcome to HCM. This passed out stone is quite possible  and  i encountered this two times in the past month. If a stent has been placed there should be no pain due to the stone as such. But, there may be other reasons for the pain and you need to be evaluated appropriately by the urologist and the general surgeon as well. Best regards DR GS </s>