For the last few days i'm felling pain on my abdomen muscles when i press it.sometimes on the left side, sometimes on the right upper side.what it be?

B sure= muscle: B sure it = muscle. By top u mean near rib cage? Do a double leg lift while on ur back. This= tighten abd muscles, now palate the area. If it is sore it usually = muscle as the underlying abd organs are protected . If not still sore it needs md eval. Still sore could b due to exercise, strain from use. If strain ice nsaids otc, activity modification. If persists c ur pcp. Strain=improving soon.