Fecal impaction (FI) is a serious condition in which a hardened stool gets stuck in the large intestine (colon), often resulting in the inability to pass stool. It often happens in people who have chronic constipation issues.

Treatment involves clearing out the stool mass. Without prompt treatment, FI can lead to intestinal wall ulcerations or perforations (holes in the intestinal wall) and even life-threatening infections and death.

FI can affect anyone but is more common in children, the elderly, people with reduced mobility (paralyzed or confined to bed), patients in long-term care facilities, or patients with severe neuropsychiatric disorders.

If you have not been able to pass stool for at least 4 days, you should seek urgent medical attention.

Most common symptoms

Pro Tip

Many people with fecal impaction still pass stool. In these cases it’s mostly liquid stool, and the stool generally passes around the impacted fecal matter in the intestines. —Dr. Adam Pont

Symptoms may depend on where the stool mass is located. You may have abdominal pain and your abdomen may be swollen. You may be able to feel a hard mass (the hardened stool) in your lower abdomen if you press it with your hand. If the hard stool is close to your anus, you may be able to feel the hard stool if you insert your finger inside.

You might be nauseous or even vomit. In other cases, liquid stool can get past the hardened stool mass causing liquid diarrhea or even incontinence (inability to control bowel movements).

Main symptoms

Inability to pass stool for at least 4 days.
After 4 (or more) days of not being able to pass stool, sudden liquid diarrhea, possibly with trouble controlling bowels.
Abdominal pain.
Swollen abdomen.
Hard mass in the abdomen that you can feel when pressing down.
Hard mass of stool in the rectum that you can feel when sticking a finger in your anus.

Other symptoms you may have

Nausea and vomiting.
Rectal bleeding.
Fever, chills, lightheadedness/dizziness, or sudden extreme worsening of abdominal pain. (These symptoms might happen if the mass pokes a hole in your intestinal wall.)
Agitation or confusion, especially in the elderly or those who can’t describe symptoms.

Is impacted stool an emergency?

It’s almost always an urgent situation. If you have not been able to pass any stool for at least 4 days (not including sudden development of uncontrollable liquid diarrhea), you should go to the ER for further evaluation and treatment.

However, if you also have severe “alarm” symptoms, you should call 911. These severe symptoms include:

Sudden, severe abdominal pain
Rectal bleeding
Difficulty breathing
New lightheadedness/dizziness, especially when standing up or sitting up

Causes of fecal impaction

Fecal impaction is often caused by untreated chronic constipation. As you get constipated, stool may start to collect in the colon. Because the colon takes water and salts out of stool, this stool collection may harden. This can disrupt the normal movements of the colon that push stool through, causing more stool to get stuck and potentially causing an obstruction.

Your colon can stretch to accommodate a large amount of stool. However, there comes a point when the mass of stool is too large to pass. Sometimes liquid stool will work its way around the mass. Stool pressing on the intestinal wall also causes inflammation that may cause liquid secretion by intestinal wall tissue. This looks like watery diarrhea.

In extreme cases, the stool mass may injure the intestinal wall, causing bleeding, or breaking through it (perforation). These situations can be life-threatening and require emergency care.

Pro Tip

I have seen patients with a mass of impacted fecal matter larger than a full-term fetus, and we were successful in significantly reducing the mass with only oral laxatives and enemas. —Dr. Pont

Treatment for fecal impaction

Once FI is confirmed by your doctor (usually after a series of X rays or an abdominal CT scan), they will confirm that you are not bleeding from your colon and do not have a hole in your colon (perforation). Treatment involves disimpaction (breaking up the stool mass) and then evacuation (removing the stool mass).

Manual disimpaction

If the stool is in your rectum (the part of your large intestine right inside the anus), your doctor will try to take it out manually. They will insert a lubricated, gloved finger into your anus to break up the mass.

Enema and laxatives

The next step may be to evacuate the stool with a combination of enemas and oral laxatives. An enema is an injection of fluid into the rectum. Rectal enemas are usually given first.

That is followed by an oral laxative (usually polyethylene glycol). How long this takes depends on the size of the stool mass.

Colonoscopy

If these methods are unsuccessful (for instance, if the impacted stool is beyond the reach of an inserted finger), the doctor (a gastroenterologist) may do a colonoscopy to look for the cause of the blockage. This is when a thin tube with a light and a lens at the end is inserted through the anus to examine the colon. If the stool blockage is found, the doctor may use the colonoscope to attempt to dislodge the stool blockage. A colonoscopy is generally done under sedation in a hospital.

Surgery

If manual (or colonoscope-assisted) disimpaction is successful, surgery is usually not required. Surgery is usually only needed if the impacted stool has caused a perforation (hole) in your intestine.

Ready to treat your fecal impaction?

We show you only the best treatments for your condition and symptoms—all vetted by our medical team. And when you’re not sure what’s wrong, Buoy can guide you in the right direction.See all treatment options

Follow up

When the impacted stool is completely cleared out, your doctor may start you on a laxative regimen to prevent constipation and another impaction. They may also suggest further testing or procedures to look for underlying conditions. If you are taking a medication (such as opioid painkillers) that causes constipation, you may need to stop taking it or adjust the dose.

Risk factors

Dr. Rx

Almost every patient I have seen with fecal impaction has been in some way mentally incapacitated—usually by dementia. Most of my advice is more likely to be something that I’m telling a family member or health care proxy. —Dr. Pont

Underlying constipation can lead to FI. People most at risk include:

Elderly
Children
People with certain neurological disorders such as multiple sclerosis or Parkinson’s disease
People with severe psychiatric illness
Residents of long-term care facilities
People with spinal cord injuries or limited mobility.
People with abnormal gut anatomy or who have had surgery on the colon or anus.
People taking certain medications, like opioid painkillers
Having a very low-fiber diet or dehydration may increase the risk.
People with metabolic disease such as hypothyroidism

Fecal impaction in children

Chronic constipation is common in children and they are also at risk of FI. Risk factors in children include:

Stool withholding behavior (consciously holding in stool for reasons including being afraid or unwilling to poop in certain situations).
Low-fiber diet.
Abnormalities of the anus.
Hirschsprung’s disease—a congenital neuromuscular disease that affects the colon and causes problems passing stool.
Spinal cord injuries.
Certain medications.

Children with fecal impaction are usually treated with oral laxatives, enemas, or suppositories.

Preventative tips

The best way to prevent fecal impaction is to recognize and treat constipation symptoms. This includes being aware of your medications can cause constipation, and talking with your doctor if you begin to notice constipation symptoms. Increasing fiber intake and drinking plenty of water may help prevent FI recurrences.

Hear what 1 other is saying

Share your story below!

First name initial (required)

Email (required; not displayed)

Title for your story (required)

Once your story receives approval from our editors, it will exist on Buoy as a helpful resource for others who may experience something similar.

The stories shared below are not written by Buoy employees. Buoy does not endorse any of the information in these stories. Whenever you have questions or concerns about a medical condition, you should always contact your doctor or a healthcare provider.

First time, worst, severe impacted BM, and how I resolved it, prevent recurringPosted July 20, 2024 by B.

This is about the best written article that described my situation and the causes. This was the first time I had fecal impaction at the age of 59 that I could not push it out even with severe straining. Previously i had 3 in diam BM that came out after 10 to 15 minutes of straining, but in this case, I prayed to God for resourcefulness because it was so impacted and had collected so much mass it felt like a medical emergency. I then though what could I do first before getting medical help and decide to use an old enema bulb, injecting about 4 to 6 oz. of water which softened it enough that I could gradually over 10 to 15 pick out enough chunks of hardened material while pushing to reduce the diameter and mass enough for it to come out, though I do have to say it gets difficult to maneuver through the anal area to effectively pull it out on the sides and it just requires a lot of patience. I can see how an older infirm person could have to the ER. I eat very large amounts of fiber, whole grains, etc,, though i take a lot of herbal and other supplements that might be affecting the transit time through the neuro signals that are supposed to cause you to go, just a theory. I do know that eating pea soup or other legume every day sufficiently softened the stools and causes a feeling to go that helps prevent this, though the BM can be almost loose sometimes or in some cases like cookie dough consistency which is way better than an impacted bowel. I noticed the worst impacted bowel when eating 3 eggs a day 3 days in a row.

Andrew Le, MD.

Dr. Le obtained his MD from Harvard Medical School and his BA from Harvard College. Before Buoy, his research focused on glioblastoma, a deadly form of brain cancer. Outside of work, Dr. Le enjoys cooking and struggling to run up-and-down the floor in an adult basketball league.

Was this article helpful?

174 people found this helpful