Common types of UC include: 1  proctosigmoiditis, which affects the rectum and lower portion of the colon. 2  left-sided colitis, which affects the left side of the colon beginning at the rectum.  total colitis, which affects the entire large intestine.
Vasovagal syncope. Vasovagal syncope is a sudden loss of consciousness mediated by the vagus nerve. It occurs when the vagus nerve is overreactive to certain triggers, such as the sight of blood or extreme emotional distress, and causes a sudden drop in blood pressure.
Before you faint due to vasovagal syncope, you may experience some of the following: 1  Pale skin. 2  Lightheadedness. 3  Tunnel vision â your field of vision narrows so that you see only what's in front of you. 4  Nausea. Feeling warm.  A cold, clammy 1  sweat. Yawning.  Blurred vision.