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).
Symptoms of large-bowel obstruction can include: 1  A bloated abdomen. 2  Abdominal pain, which can be either vague and mild, or sharp and severe, depending on the cause of the obstruction. 3  Constipation at the time of obstruction, and possibly intermittent bouts of constipation for several months beforehand.