What should you know about absolute constipation?

The phrase is not used consistently, so a clinician will clarify when you last passed stool or gas and whether the change was sudden.

A complete stop in bowel movements is different from simply passing hard stools less often. When stool and gas cannot move through the bowel, a blockage or severe slowing of the bowel must be considered. Abdominal swelling, cramping, nausea, or vomiting make this more concerning.

Constipation can also accompany dehydration, a change in diet or activity, certain medicines, irritable bowel syndrome, or an underactive thyroid. Those causes do not remove the need to assess new red-flag symptoms.

If you can still pass gas, have no severe pain or vomiting, and otherwise feel well, drink fluids regularly, keep gently active, and note your bowel pattern. Review recent changes in medicines, supplements, food, travel, and routine.

Do not keep increasing laxatives or use an enema when you cannot pass gas, your abdomen is increasingly swollen, or vomiting has started. These features need assessment before further self-treatment. A clinician may examine your abdomen and rectum and decide whether testing or imaging is appropriate.

Seek urgent medical care for severe or worsening abdominal pain, a markedly swollen abdomen, repeated vomiting, inability to pass both stool and gas, fainting, confusion, blood in the stool, or black stool. These warning signs can occur when the bowel is blocked or another acute problem is present.

Arrange a routine medical review when constipation persists, repeatedly returns, follows a new medicine, or occurs with unexplained weight loss, ongoing tiredness, or a lasting change in stool shape or bowel habit.

Ask whether your symptoms suggest simple constipation or possible obstruction, whether any prescribed or over-the-counter medicine could be contributing, and which laxative—if any—is suitable. Also ask whether thyroid testing, a rectal examination, or abdominal imaging is warranted based on your symptoms.