What's the difference between spastic colon , functional bowel disease , mucous colitis and ibs . how i can now that i am suffering from them ?!

Essentially the same: The terms have often been used synonymously. However, a coating of mucus (a colon lubricant) when present in large volume may signal not only problems with colon spasm (ie. Irritable bowel syndrome), but also partial obstruction, infection, ; even sloughed colon lining due to a variety of diseases. It's critical to distinguish ibs from inflammatory bowel diseases (crohn's, ulcerative colitis...).

Gastroenterology: You want to know if you have spastic colon, mucus colitis etc. A gastroenterologist can evaluate your stool and if required may perform a study called colonoscopy. Any times the doctor can get a lot of answers by talking to you about your stool habits.