<s>[INST] my 6 year old son has severe stomach pain, it comes and goes. He had a CT scan at the emergency room last night and they said all came back normal. They said it was not his appendix. This happened about 6 months ago and it went away. The pain was severe yesterday and lasted about 5 hours on and off. Could this be his gallbladder? If so would the CT scan show that? There is no fever, vomiting, diarreah, nothing but the pain. The ER doctor said it was gas but I am not comfortable with that diagnosis. It is mildly hurting this morning but not as severe [/INST] Hellman may be due to gall bladder pathology. CT scan is not sensitive for gall bladder calculus. It can only detect 40 % of calculus. I suggest for ultrasound of abdomen. This is mainly advised to screen gall bladder. Ultrasound is very sensitive to detect gall bladder pathology. If it is fine then other causes like acidity etc. can be considered. Treatment depend upon findings. Get well soon. Take Care Chat Doctor.  </s>