Most adhesions are painless and do not cause complications. However, adhesions cause 60%-70% of small bowel obstructions in adults and are believed to contribute to the development of chronic pelvic pain. Adhesions typically begin to form within the first few days after surgery, but they may not produce symptoms for months or even years. The digestive system can be affected as scar tissue begins to restrict motion of the small intestines. The passing of food becomes progressively more difficult. Eventually, the bowel may become blocked. This can cause distention, severe abdominal pain, constipation and bowel obstruction.