It is not unusual to have some shoulder pain after surgery. This pain is from irritation to the diaphr It is not unusual to have some shoulder pain after surgery. This pain is from irritation to the diaphragm during the surgery either from the band or the presence of gas after surgery. A heating pad on your shoulder blades or the upper abdomen may help. This pain, if you have it, should gradually subside over several days, but occasionally lasts longer.agm during the surgery either from the band or the presence of gas after surgery. A heating pad on your shoulder blades or the upper abdomen may help. This pain, if you have it, should gradually subside over several days, but occasionally lasts longer.