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.
People older than 45 years of age rarely experience a first common faint.. Causes of vasovagal syncope include the following: 1  Environmental factors: Most commonly in a hot, crowded setting. 2  Emotional factors: Stress or the sight or threat of injury.