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When Should You See a Doctor for Constipation?

Most constipation is minor, but these signs mean it is time to get it checked

September 5, 2026 By Dr. Amber Khan, MD 6 min read

Constipation is something almost everyone deals with now and then, and most of the time it clears up with simple changes. But constipation can also be a signal that something needs attention, and knowing when to see a doctor takes the guesswork out of it. Here is a clear guide to when constipation is worth a visit to a gastroenterologist.

When Constipation Is Usually Fine

Short-lived constipation from travel, a change in diet, low fiber, not enough fluids, or a new medication is common and usually resolves on its own. In these cases, more fiber and water, regular activity, and not delaying the urge to go are often all that is needed. Our constipation relief guide covers the basics.

See a Doctor If It Is Ongoing

It is worth being evaluated when constipation:

  • Lasts more than three weeks despite fiber, fluids, and activity
  • Keeps coming back
  • Is a new change from your normal bowel pattern
  • Requires regular laxative use to have a bowel movement

Persistent constipation can often be improved with the right approach, and sometimes points to an underlying cause worth treating.

Warning Signs That Should Not Wait

Some symptoms alongside constipation deserve prompt attention:

  • Blood in the stool or rectal bleeding
  • Unexplained weight loss
  • Ongoing belly pain or cramping
  • Stools that have become thin or narrow
  • Constipation with vomiting or an inability to pass gas, which can signal a blockage and needs urgent care
  • A new change in bowel habits after age 45

These are the signs that separate ordinary constipation from something that needs a closer look, including screening for colorectal cancer.

What an Evaluation Involves

A gastroenterologist starts with your history and an exam, and may check for causes such as an underactive thyroid, medication effects, or problems with the pelvic floor muscles. When there are warning signs, or you are due for screening, a colonoscopy looks at the colon directly. Most causes of constipation are very treatable once identified.

The Takeaway

Occasional constipation is normal and usually clears with simple steps. See a doctor if it lasts more than a few weeks, keeps returning, or comes with any warning sign like bleeding, weight loss, or a new change in your pattern. Getting it checked is simple, and it either fixes the problem or rules out anything serious.

Talk to a Gastroenterologist in Mountainside, NJ

If your symptoms keep coming back or you are not sure what is causing them, Dr. Amber Khan can help. We see patients from across Union County and New Jersey.