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.
During a vasovagal syncope episode, bystanders may notice: Jerky, abnormal movements; A slow, weak pulse; Dilated pupils; Recovery after a vasovagal episode generally begins in less than a minute. However, if you stand up too soon after fainting â within about 15 to 30 minutes â you're at risk of fainting again. When to see a doctor