Does small bowel obstruction usually cause many symptoms?

Yes. Small bowel obstruction is typically the result of a blockage of one's small bowel and presents with symptoms of crampy abdominal pain, nausea, and vomiting. This is typically caused by adhesions or scar tissue as a result of previous surgery. It is typically treated conservatively with bowel rest (nothing by mouth) and IV fluids. Surgery may be necessary at times.