Hello, Thanks for the query to H.C.M.C. You feel pain on left side of abdomen after if you sit long time.
Pain is also on the shoulder of left side, over it.
Shortness in breathing and clogging in nostril
There a dome shaped muscular partition separating the thorax( chest) from the abdomen. I want to make clear that the nerve supply of shoulder and Diaphragm ( muscular partition mentioned earlier)is same and one that is phrenic nerve
so if there is pain in diaphragm ( left side of abdomen) you feel pain in left shoulder, that is the reason so need not to worry about this.
Now "Q" is this that , why, pain on left side ?
May be due to exertion (fatigue
) for long sitting.