A hard stomach that is painful is worrisome for an acute or surgical abdomen. In other words, an operation is, or soon will be, necessary.
However, since you didn't mention pain and described it as from above his belly button to below us sternum, it makes me think of a diastasis rectus, which is a weakening of the fascia of the abdominal wall. In this situation, when he lies flat, the mass/lump should disappear. However, should he lift his head and especially if he does even half a situp, it will appear. This is not a hernia so it's purely a cosmetic issue and no surgery is necessary - if indeed this is all it is.
Abscesses or pus pockets can also arise but something that big would most likely be accompanied by pain & fever. Also, abscesses are typically described as fluctuant or fluid filled, rather than hard, although I suppose a tense pus pocket that's hard could be ready to rupture and leak.
If he had abdominal surgery that went right down the middle, perhaps the sutures broke down such that you're describing an incisional hernia. This would require surgery to fix.
It's doubtful that HepC would lead to this. An upper GI (regardless of whether you're describing an xray or endoscopy) won't show what's going on here.
The easiest solution to all this is for him to go see his family physician who'll be able to diagnose him very quickly with the additional information I asked about above.
after 2 weeks of working out eating healthy standing long hours ( i was leaning to 1 side at the time ive noticed ) protien shakes around 1200 cals a day or more.... also 4 Ls of water a day ( exercises include 6 min abs bike riding dumbbells sqauts and palaetes ) also abdominal massages to try loosen up the abdominal fat ( i am skinny ) i noticed the left side poking out alot more then the right side next to the belly button... i thought :o ab!!??? then i realised no swelling... with a dul pain that radiates sometimes down to my hip bone im having a masive anxiety attack over this or its real ? first thing i thought was stomach cancer ? small intestine cancer ? then i thought i dont wanna tell my parents this and stress them out first dr said its normal just the intestine that moves i gave it 4 weeks with no exercises it was still there the 2nd dr said its abnormal but i shouldnt worry and relax come back in 2 weeks so i did so now he said he cant feel nothing while the abdominals have swollen... ( it goes up and down ) after all of this im due for scans tomorrow wich freak me out making me wanna just sleep and not worry but i cant cause i dislocated my arm for the 2nd time and cant sleep proper ive also cleaned out a house im doing up to set for ppl to rent out and there was mice feccies if theres any diseases in that ?? but the drs think im mad and no1 cares does anyone have any idea what this could be ??????( the dr also said while examined its not a hernia or a ceptic ulcer )
tomorrow i get an ultra sound and i wanna spew up im scared that if they find something ill have to sneak it around my family and get it all done also my arms dislocated the other day and im now feeling like im broken this sucks
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