Hello! Welcome to HCM.
On left upper side of abdomen is the
spleen.
Did you have any trauma to abdomen or chest?
This can cause splenic injury, if trauma is on left upper part of abdomen.
Also, this can cause pain on tip of left shoulder which is
referred pain.
Pain can also be musculoskeletal or due to increased secretion of acid in stomach.
For correct diagnosis, clinical examination of abdomen by your doctor is necessary.
In my clinic, after clinical examination, I advise
ultrasound abdomen & pelvis, CBC.
Treatment is done accordingly.
Till then avoid hot/spicy food, alcohol,
smoking, late night meals, reduce stress if any with yoga &
meditation.
Hope this helps.
Wish you speedy recovery.
Thanks.
Regards.