What is tenesmus?

Short answer

MedlinePlus defines tenesmus as the feeling that you need to pass stool, even though your bowels are already empty. It may involve straining, pain and cramping, and people with it may push very hard but pass only a small amount. It’s a symptom, not a diagnosis, so the useful question is what’s behind it.

	What MedlinePlus says
What it feels like	An urge to poop when the bowel is already empty
What may come with it	Straining, pain, cramping, passing only a little stool
Most common setting	Inflammatory diseases of the bowel, from infection or other conditions
Also seen with	Motility disorders, which affect how the intestines move
See a provider	If it continues, or with pain, blood, chills, fever, nausea or vomiting

What does tenesmus feel like?

Most people describe it as “I just went, so why do I need to go again?” The urge is real, but little or nothing comes out. Some people sit and strain for a long time, which can make things sore.

It’s worth separating three similar feelings, because doctors will ask:

Feeling	Where it shows up in official sources
An urge to go when the bowel is empty	Tenesmus (MedlinePlus)
A feeling that you haven’t finished a bowel movement	Listed among IBS symptoms (NIH)
Straining and feeling like you cannot empty your bowels fully	Part of IBS constipation (NHS)
Feeling like you still need to poo after going	Listed among symptoms of piles (NHS)
Often feeling like you need to poo, even if you’ve just been	Listed among possible bowel cancer symptoms (NHS)

Same sensation, very different causes. That’s why a pattern over days matters more than one uncomfortable morning.

What causes tenesmus?

MedlinePlus says tenesmus most often happens with inflammatory diseases of the bowels, which may be caused by an infection or other conditions. It can also happen with motility disorders, which affect the normal movement of the intestines. Causes it lists include:

• infection of the colon (infectious colitis)
• inflammation of the colon or rectum from radiation (radiation proctitis or colitis)
• inflammatory bowel disease (IBD)
• movement (motility) disorders of the intestines

Its full list also includes conditions such as an anorectal abscess and colorectal tumors. If you’ve recently had a tummy bug, MedlinePlus notes your provider may ask whether you ate raw, new or unfamiliar foods, or whether others at home have similar problems.

What will a doctor ask?

MedlinePlus lists the questions a provider is likely to ask. Having the answers ready makes the visit faster:

• When did this start? Have you had it before?
• What other symptoms are you having?
• Have you eaten any raw, new or unfamiliar foods, or eaten at a picnic or large gathering?
• Does anyone else in your household have similar problems?
• What other health problems do you have or have you had?

The physical exam may include a detailed tummy exam, and a rectal exam is done in most cases. Tests can include blood tests, stool cultures, a look at the colon and rectum (colonoscopy) or a proctosigmoidoscopy, an exam of the lower bowel.

How do I keep a useful log of it?

PoopAI logs each poop with its Bristol type, with an optional photo, and your meals by photo or text. It doesn’t log symptoms, so keep the “still need to go” feeling as a paper note next to your entries.

Mon 08:10  Poop: type 6
Paper note: urge again 08:40, nothing passed, cramping
Mon 12:30  Meal: chicken wrap, side salad
Tue 07:55  Poop: type 5
Paper note: urge again twice before 10:00, small amount
Paper note: no blood seen, no fever

Two weeks of this tells a doctor how often it happens, whether it follows loose or hard stools, and whether anything else is changing.

Tenesmus myths vs facts

Myth	Fact
“If I push harder, it’ll pass.”	MedlinePlus says people with tenesmus may strain hard but pass only a small amount. Straining doesn’t fix the cause.
“It’s always constipation.”	MedlinePlus says it most often happens with inflammation of the bowel, from infection or other conditions.
“It’s just IBS.”	The same feeling appears in NHS lists for piles and bowel cancer. Only a doctor can sort out which applies.
“Nothing can be done at home.”	MedlinePlus says more fiber and fluid can help ease constipation, if constipation is part of the picture.

Before your appointment

• Note when the feeling started and how often it happens
• Note the Bristol types around it
• Write down any blood, pain, fever, chills, nausea or vomiting
• Note any recent tummy bug, travel or unusual food
• List your medicines and past bowel problems

When should I get help?

MedlinePlus says contact a provider if tenesmus continues, or if you also have:

• tummy pain
• blood in your stool
• chills or fever
• nausea or vomiting

The NHS says ask for an urgent GP appointment or call 111 for black or dark red poo, or bloody diarrhea. Call 999 or go to A&E for heavy or non-stop bleeding from your bottom.

Where does PoopAI fit?

PoopAI is a quick log of Bristol types and meals, with weekly reports and trend charts. It won’t tell you why you have tenesmus. It can make the timeline you take to a doctor clearer.

Bottom line

Tenesmus is the urge to poop with nothing left to pass. It’s most often linked to inflammation of the bowel, and it overlaps with symptoms of IBS, piles and more serious conditions. If it keeps happening, or comes with pain, blood or fever, see a doctor. If constipation is part of it, see our constipation guide and how to sit on the toilet.

Editorial note: Written by The FixMyGut team using the MedlinePlus, NIH and NHS sources listed below. It’s general information, not a diagnosis. Facts checked against those sources on November 5, 2026.