Why it occurs
It’s believed that inflammation in the bowel may affect the nerves that control the excretion of waste.
When these nerves are overstimulated, they may send a signal to your brain saying there’s still material in the bowel.
That can trigger the muscles in the gut that are used to push out faeces.
Those muscles contract, so your body thinks it needs to have a bowel movement, but really there’s nothing in the colon.