Apparently he has a chronic illness called ulcerative colitis which are stomach cramps that don't end and causes inflamed bowels and intestines. It's an incurable disease and he's had it all his life. Some people even end up having to wear a colostomy bag. In 2006 he actually had to resign because of non-stop stomach cramps and diarrhoea. He thought he would beat the condition so he made a comeback in 2012 as a Prime Minster but he relapsed again which lead to him having to resign again.