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).
If the tumor gets large enough, it may completely or partially block your colon. You may notice the following symptoms of bowel obstruction: Abdominal distension: Your belly sticks out more than it did before without weight gain. Abdominal pain: This is rare in colon cancer. One cause is tearing (perforation) of the bowel.