Mucus In Stool Why Am I Having Abdominal Pain And Mucus In My Stool?

Why am I having abdominal pain and mucus in my stool? - mucus in stool

I am 17 years old and in a family with a history of intestinal problems. Back in March I had a similar problem, but then left. This time is similar. My chair is almost entirely water. It is a green / yellow, and seems to have, bile and phlegm. Is this a bug? What can I do?