I had an operation for a twisted bowel almost 1 year ago. Since then I have had such a distended and very hard top part of my stomach just under the bust, although the operation scar is from my navel down. This makes me feel it is not scar tissue so what could be the cause? I have been going to the gym and wonder perhaps i am building a bit of muscle but have too much fat on top. Any ideas? Anyone else experienced this?