Warning Sign #2: Significant Abdominal Swelling
Bloating is common with constipation.
But marked abdominal distension is different.
If the abdomen becomes unusually swollen, tight, or increasingly enlarged—especially when accompanied by pain, vomiting, or inability to pass stool or gas—it may indicate that intestinal contents and gas are not moving normally.
That can require urgent evaluation.
Warning Sign #3: You Cannot Pass Gas
This symptom is particularly important.
Constipation may make bowel movements difficult, but a complete inability to pass gas can sometimes occur with an intestinal obstruction.
When it occurs together with abdominal pain, swelling, vomiting, or worsening discomfort, it should not be ignored.
Seek urgent medical evaluation rather than repeatedly taking laxatives at home.
Warning Sign #4: Persistent Vomiting
Vomiting isn't a typical feature of uncomplicated mild constipation.
If someone with severe constipation begins repeatedly vomiting, particularly if the abdomen is swollen or painful, a blockage or another serious gastrointestinal problem needs to be considered.
This is especially important if the person cannot keep fluids down.
Dehydration can develop quickly when vomiting is persistent.