<s>[INST] my 4 year old has stomach pains especially when he stands up. He has no fever, is not vomiting and had a normal bowel movement earlier today. He has woken up crying with it and has now gone back to sleep but has been complaining of having a tummy ache since he came out of school this afternoon. [/INST] Hi, The possibilities could be:1. Habitual constipation2. Psoas abscess3. Muscular spasm of the abdominal muscles4. Undiagnosed hernia. Please consult his pediatrician.Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Sumanth Amperayani, Pediatrician, Pulmonology </s>