Constipation is associated with fever and lower abdominal pain or swelling.
You have vomiting or a loss of appetite
You have blood in your stools; this may be from a fissure or hemorrhoid but could also be a sign of colorectal cancer; changes in bowel movement pattern, such as passing pencil-thin stools, may also signal colorectal cancer.
Your constipation develops after you start a new prescription drug or take vitamin or mineral supplements; you may need to discontinue the medication or change dosage.
You or your child has been constipated for two weeks
You are elderly or disabled and have been constipated for a week or more; you may have an impacted stool.
You are losing weight even though you aren't dieting