Extremely low blood pressure can develop in seconds (as with bleeding from trauma), in minutes (as with a peanut allergy), or over the course of hours (as with a worsening infection, such as toxic shock syndrome).
The symptoms of a bowel obstruction are. 1  Feeling bloated and full. 2  Pain (usually colicky tummy pain). 3  Feeling sick. 4  Vomiting large amounts (including undigested food or bowel fluid).
The first indication of a bowel obstruction is often pain, nausea or vomiting accompanied by difficulty or inability to pass gas or stool. Blocked from its normal clear passage, food becomes backed up. The intestines stop functioning, preventing the patient from eating or eliminating waste.