In ulcerativecolitis,only the colon is affected; of the multiplelayers of the intestinal wall,only the innermost lining of the colon,the mucosa, becomes inflamed in ulcerative colitis patients. Ulcerative colitis also spreads proximally,meaning it starts from the rectum and can spread continuously to the rest of the large intestine(colon).
Crohn’s disease,on the otherhand,may affect any part of the gastrointestinal (GI)tract,from the lips to the anus.Unlike ulcerative colitis, Crohn’s can skip large segments of bowel before reappearing in others.The areas most often affected,however,are the lower part of the small intestine(ileum)and the large intestine(colon). Also, in Crohn’s patients, the inflammation doesn’t stop at the mucosa (tissue lining)and may burrow through the thickness of the bowel wall.
Proctitis is an inflammation of the lining of the rectum, the end of the large intestine where stool passes through. It causes pain, soreness, bleeding, and a discharge of mucus or pus. It can also make you feel like you need to have a bowel movement all the time.
Proctitis can last a long (chronic) or a short (acute) amount of time. When the inflammation spreads beyond the rectum, the condition is often called proctocolitis.
Your doctor can usually treat proctitis successfully. Treatment depends on what's causing the inflammation. Sometimes proctitis can be treated the same way as inflammatory bowel disease, a condition where the lining of other parts of the digestive tract get inflamed.
Also it would depend on the type of proctitis you are dealing with such as ulcerative proctitis as opposed to ischemic protitis, infectious proctitis etc.