“I have pain in my lower abdomen and my stool is loose and slimy. Could this be related to my prostate?”
Quick Answer
Lower abdominal pain can occur with some prostate conditions, particularly prostatitis or chronic pelvic pain syndrome, but loose or mucus-containing stool is much more likely to come from the digestive tract than from an enlarged prostate.
BPH mainly causes urinary symptoms such as a weak stream, difficulty starting urination, incomplete bladder emptying, urgency, frequency and waking at night to urinate.
If mucus in the stool keeps occurring, especially with diarrhea, blood, fever, weight loss or significant abdominal pain, you should be assessed for a gastrointestinal cause rather than assuming the prostate is responsible.
Can a Prostate Problem Cause Lower Abdominal Pain?
Yes, some prostate and urinary conditions can cause discomfort in the lower abdomen or pelvis.
For example, men with prostatitis or chronic prostatitis/chronic pelvic pain syndrome may experience pain in the lower abdomen, pelvis, perineum, penis, scrotum or lower back.
Severe urinary retention from an enlarged prostate can also cause lower abdominal discomfort because the bladder becomes overly full.
However, prostate disorders do not usually explain loose, mucus-containing stool.
Lower abdominal pain alone could involve the urinary or prostate system, but lower abdominal pain together with loose or slimy stool points more strongly toward the bowel.
Does an Enlarged Prostate Cause Loose Stool or Mucus?
Usually, no.
Benign prostatic hyperplasia, or BPH, primarily affects the urethra and bladder outlet.
Typical enlarged prostate symptoms include:
- weak urinary stream
- difficulty starting urination
- stopping and starting during urination
- feeling that the bladder has not emptied completely
- urinary urgency
- frequent urination
- waking repeatedly at night to urinate
Diarrhea, loose stools and mucus in stool are not typical BPH symptoms.
What Does “Slimy Stool” Usually Mean?
What many people describe as “slime” is mucus.
Your intestine normally produces mucus to lubricate and protect its lining, so a small amount may occasionally be seen in stool.
However, a noticeable increase in mucus, particularly when accompanied by loose stool or abdominal pain, can occur with several bowel conditions.
| Possible cause | Other features that may occur |
|---|---|
| Short-term intestinal infection | Diarrhea, cramps, nausea, fever or recent contaminated food or travel exposure. |
| Irritable bowel syndrome (IBS) | Abdominal pain, bloating, diarrhea, constipation or alternating bowel habits; mucus may occur. |
| Inflammatory bowel disease | Persistent diarrhea, abdominal pain, blood or mucus in stool, fatigue or unintended weight loss. |
| Proctitis | Rectal discomfort, urgency, diarrhea or constipation, mucus, pus or blood from the rectum. |
| Food intolerance or dietary trigger | Symptoms associated with particular foods, bloating, diarrhea or cramping. |
| Other bowel disease | Persistent change in bowel habits, bleeding, weight loss or other symptoms requiring investigation. |
Are Parasites the Most Likely Cause?
No.
The old version of this answer suggested that loose slimy stool was most likely parasitic.
Parasites can cause diarrhea in some circumstances, particularly after certain travel, water or food exposures, but they are only one possible explanation.
Testing should be guided by the person’s symptoms and exposure history rather than automatically ordering parasite testing for everyone with mucus in stool.
A clinician may decide that stool testing is appropriate if diarrhea persists, if there has been relevant travel or exposure, or if an infectious cause is otherwise suspected.
Could Prostatitis Cause Similar Pain?
Yes, but it would not usually explain the mucus.
Prostatitis or chronic pelvic pain syndrome may cause:
- pelvic or lower abdominal pain
- pain between the scrotum and anus
- pain during or after ejaculation
- painful urination
- urinary frequency or urgency
- weak urinary flow in some men
If these symptoms accompany your abdominal discomfort, a urinary or prostate evaluation may also be reasonable.
You can read more in my guide to prostate and pelvic pain.
Should You Have a PSA Test Because of These Symptoms?
Not simply because you have lower abdominal pain and loose stool.
PSA is a prostate-related blood marker used as part of prostate cancer risk assessment and in other specific clinical situations.
It is not a test for diarrhea, mucus in stool or ordinary gastrointestinal pain.
Whether PSA testing is appropriate depends on factors such as:
- age
- prostate-cancer risk
- family history
- urinary or prostate findings
- previous PSA values
- discussion of the potential benefits and limitations of testing
If PSA testing is relevant for another reason, see my guide to understanding PSA.
Do You Automatically Need a Prostate Ultrasound?
No.
The old answer recommended urine testing, ultrasound of the kidneys, bladder and prostate, and PSA almost automatically.
That is more testing than is justified by the limited symptoms described.
The first step should usually be a medical history and examination aimed at determining whether the symptoms appear primarily gastrointestinal, urinary or both.
Urinalysis may be appropriate if there are urinary symptoms such as painful urination, urgency, frequency, unusual urine, fever or difficulty emptying the bladder.
Imaging can then be selected if the clinical findings suggest that it is needed.
Could Prostate Medicines Cause Diarrhea?
Possibly.
If a man is already taking medication for a prostate condition and develops new bowel symptoms, medication side effects should be considered.
Different medicines have different adverse-effect profiles, so the timing is important:
- Did the diarrhea begin after starting a new medicine?
- Did it begin after increasing the dose?
- Are any other new medicines or supplements being taken?
- Does the symptom improve when the medicine is not being used?
Do not stop an important prescription medicine without discussing it with the prescribing clinician.
For information on commonly prescribed drugs, see my BPH medication guide.
What About Previous Prostate Radiation?
This is one situation where prostate-cancer history can become relevant to bowel symptoms.
Radiation to the prostate and surrounding pelvis can sometimes affect the rectum.
Radiation proctitis or radiation proctopathy can cause symptoms such as:
- rectal urgency
- frequent bowel movements
- diarrhea
- mucus
- rectal bleeding
- rectal or lower abdominal discomfort
If you have previously had pelvic radiation and now have persistent bowel symptoms, tell the clinician who evaluates you about the radiation history.
Could This Simply Be Food Poisoning?
It could be an acute gastrointestinal infection or food-related illness, particularly if the symptoms began suddenly after eating and other people who ate the same food are also ill.
However, symptoms alone cannot establish the cause.
The old version of this page advised drinking large amounts of warm water until vomiting occurred. I do not recommend this. Inducing vomiting does not “clean” the gastrointestinal tract and can cause additional problems.
For ordinary short-lived diarrhea, preventing dehydration is usually more important.
Fluids should generally be taken in manageable amounts. Oral rehydration solutions can be useful when diarrhea is substantial because they replace both water and electrolytes.
When Should You See a Doctor?
Medical assessment is appropriate when mucus or a change in bowel habits keeps occurring rather than settling quickly.
Arrange evaluation particularly if you have:
- persistent or recurrent mucus in stool
- diarrhea that does not resolve
- blood in the stool
- unexplained weight loss
- fever
- persistent or worsening abdominal pain
- night-time diarrhea
- marked fatigue
- a significant change from your normal bowel habits
Blood or mucus associated with abdominal pain can occur with inflammatory bowel disease, proctitis, infection and other disorders that deserve proper evaluation. :contentReference[oaicite:2]{index=2}
When Is It Urgent?
- severe or rapidly worsening abdominal pain
- significant blood in the stool
- repeated vomiting or inability to keep fluids down
- signs of significant dehydration
- high fever or severe illness
- complete inability to urinate
- severe lower abdominal pain with urinary retention
How Can You Tell Whether the Problem Is Prostate or Digestion?
| Symptoms pointing more toward prostate/urinary tract | Symptoms pointing more toward bowel/digestive tract |
|---|---|
| Weak urine stream | Loose stools or diarrhea |
| Difficulty starting urination | Mucus in stool |
| Incomplete bladder emptying | Bowel urgency |
| Urinary frequency or urgency | Blood mixed with stool |
| Painful urination | Abdominal cramps associated with bowel movements |
| Pain during ejaculation | Bloating or change in stool frequency |
| Pelvic/perineal pain | Diarrhea after meals or infection exposure |
There can be overlap, which is why the complete symptom pattern is more useful than focusing on the location of abdominal pain alone.
Donald, based only on the symptoms you provided, I would think first about a gastrointestinal cause for the loose and mucus-containing stool rather than assuming an enlarged prostate. A prostate or pelvic condition could still contribute to lower abdominal pain, particularly if you also have urinary symptoms or painful ejaculation. If the bowel changes continue, the priority is a proper medical assessment rather than automatically performing PSA testing or taking treatment for the prostate.
National Institute of Diabetes and Digestive and Kidney Diseases. Prostate Problems.
National Institute of Diabetes and Digestive and Kidney Diseases. Symptoms and Causes of Proctitis.
Medical information notice: This educational article cannot diagnose the cause of pelvic, urinary or abdominal symptoms. Persistent or worsening symptoms require individualized medical assessment. Fever, severe pain, inability to pass urine or other concerning new symptoms require prompt medical care.