From where I come from, if you have had quite a number of surgeries, you will get air
pockets in your stomach and hence you would find you have bloatedness in your tummy due to the air/
gas. It is always recommendable that after a surgery most people in my country drink ginger to relieve the air pockets/or what we call "wind in the stomach". After giving birth we are also asked to consume alot of ginger to relieve the wind in the stomach as well which also causes flatulence.