<s>[INST] A male has a hard swollen abdomen , it s been going on for quite a while and the hospital had found nothing. there is no pain but he can feel a kind of ball thing in his belly. a couple of months ago he couldn t eat for a week because even without eating his belly swelled up a lot (i.e he couldn t zip up his trousers) i was thinking about IBS but that would show in the colonoscopy wouldn t it? the person in aged between 15-30 years old. [/INST] Hi, This is possible in some conditions.  He might have absolute constipation which can give rise to fullness of abdomen and hard fecal mass may feel like lump in abdomen.  If more fat deposited in abdomen, there is bulging of abdomen.  Avoid constipation, take light purgative daily at night. Take more green vegetables and salads.  If more fat in the abdomen, reduce weight, do leg raising exercise daily. </s>