What is life like with an invisible disability in London? About 540,000 people suffer from IBD in the UK and more than 69,000 of them are in the capital.
Some sufferers say the lack of toilets is the worst thing about city living.
Bethany Jacobs has Crohn’s disease and lives with a permanent stoma bag.
“I think you need to break down those barriers and open up these conversations where we talk about invisible diseases like Crohn’s,” she said.
Video from Jim O’Reilly