Avoid Milk!
I hope this helps someone suffering from what I had.
I had mucous running continuously from my bowels for two years. It was so bad I wanted to die. I had a small polyp removed but it wasn't cleared up until I stopped eating anything that had milk in it. There's a protein in milk (casein,) perhaps more than one, that the body reacts to as a foreign substance. It causes inflammation and kicks the immune system in gear so your immune response is probably hyperactive. And if you're continuously eating products with milk, it won't go away and you'll never learn the cause. The milk also creates mucus on your intestine so you?re not absorbing/processing food as efficiently. I also feel my milk consumption created the polyp.
I hope this helps you, and wish that doctors had been smart enough to figure it out. But they weren't. It took a while for me to find the source of the problem but now I'm okay unless I have milk products: then it starts up again. Good luck to you.