Can You Get A Fever From Constipation? Causes, Symptoms & When to Worry
The Quick Answer
No, constipation does not cause a fever. Constipation happens when your digestive system slows down, but a fever is your body’s way of fighting off infection or inflammation. If you have both simultaneously, it strongly suggests another underlying condition—such as a stomach infection, appendicitis, or diverticulitis—is causing both symptoms.
Having a high fever, severe stomach pain, and an inability to have a bowel movement at the same time can be very uncomfortable. It may seem like constipation is causing the fever, but the body does not work that way.
In this article, we explain why these symptoms can happen together, what serious conditions can cause them, and when you should seek medical care.
Why Constipation Doesn’t Cause Fevers
To understand why the answer to can you get a fever from constipation is always “no,” you must understand how your body handles waste and illness.
Constipation
Functional constipation is a mechanical plumbing issue. Stool moves too slowly through your colon, allowing your body to absorb too much water. The result is dry, hard stool that is tough to pass. Being backed up physically cannot raise your body’s temperature.
Fever
A fever is an immunological alarm system. When a virus or bacteria invades, your immune system purposely raises your core temperature to create an environment where the germs cannot survive. If you have a fever, your body is fighting off an active infection.
How a Fever Can Cause Constipation
Constipation does not cause a fever, but a fever can sometimes lead to constipation. When you are sick with a virus, such as the flu or tonsillitis, and have a fever, your body sweats and loses fluids quickly.
If you are not drinking enough water, you can become dehydrated. Without adequate hydration, your colon takes water directly from your stool, turning it into hard, tough pebbles that are difficult to pass.
Furthermore, when you are sick, you are likely resting in bed and eating less fiber, which can also slow your gastrointestinal tract.
5 Serious Conditions That Cause Fever and Constipation
If a regular cold is not the cause, then what causes constipation and fever at the same time? Most often, it is a serious inflammation or infection in your digestive system.
If you have both constipation and a fever, your doctor will check for these possible conditions:
| Medical Condition | Key Symptoms | Required Action |
|---|---|---|
| Diverticulitis | Sharp pain (usually lower left belly), fever, nausea, and severe constipation. | See Doctor Quickly Needs prescription antibiotics. |
| Appendicitis | Dull ache shifting to sharp lower right belly pain, high fever, vomiting, inability to pass gas. | Emergency Room Danger: Can burst in 48-72 hours. |
| Fecal Impaction | Mild fever, chills, severe cramps, and a complete block of stool passage. | Medical Care Requires intervention to remove blockage. |
| Inflammatory Bowel Disease | Fever during flare-ups, alongside cycles of severe diarrhea, rectal bleeding, and constipation. | Specialist Care Management of autoimmune inflammation. |
| Gastrointestinal Infection | Fever, dehydration, and temporary painful constipation (or diarrhea). | Monitor closely Hydration; medical care if severe. |
1. Diverticulitis
As people get older, small bulges (diverticula) can form in the lining of the colon. These pouches are common and usually do not cause problems.
However, if stool or bacteria get trapped and cause these pouches to become infected, it leads to diverticulitis.
- Symptoms: It causes sharp pain, usually on the lower left side of the belly, along with a fever, nausea, and severe constipation.
- Treatment: Usually involves seeing a doctor quickly and taking prescription antibiotics.
2. Appendicitis
The appendix is a small pouch connected to your large intestine. If it gets blocked by stool or infection, it swells up and fills with pus.
- Symptoms: It starts as a dull ache near your belly button that quickly turns into sharp pain in the lower right side of your belly. This comes with a high fever, vomiting, and suddenly not being able to pass gas or stool.
- Treatment: Go to the emergency room right away. An inflamed appendix can burst within 48 to 72 hours, which is very dangerous.
3. Fecal Impaction and Bowel Obstruction
If long-term constipation is not treated, a large, hard mass of stool can get stuck in your colon or rectum. This is called fecal impaction, and it prevents anything from passing through.
Over time, trapped stool can cause inflammation and infection of the colon lining, triggering your immune system to react and leading to a mild fever, chills, and severe cramps.
4. Inflammatory Bowel Disease (IBD)
Autoimmune diseases like Crohn’s disease and ulcerative colitis cause ongoing, severe inflammation in the digestive tract. During flare-ups, the immune system attacks healthy tissue in the gut.
This strong inflammation often causes a fever, along with cycles of severe diarrhea, rectal bleeding, and constipation.
5. Gastrointestinal Infections (Stomach Flu)
Bacterial or viral gastroenteritis, also called food poisoning or stomach flu, can upset the balance of bacteria in your gut.
We usually think of these infections as causing diarrhea, but the inflammation and dehydration can also slow digestion and lead to temporary, painful constipation.
Constipation and Fever in Babies and Children
When a baby or toddler has a fever and stops having bowel movements, it is normal for parents to worry. But just like in adults, constipation does not cause a fever in babies.
However, children can easily get caught in the cycle of fever and dehydration. If a child has an ear infection, chickenpox, or a sore throat, they will have a fever.
If their throats hurt or they feel tired, children may not want to drink milk or water. This quick dehydration dries out their stool and leads to constipation.
When to call the pediatrician: If their fever is over 100.4°F (for babies under 3 months) or 102°F (for older children), or if their belly is swollen and hard. Get medical help right away to check for appendicitis or a blockage.
Causes of Constipation (Without a Fever)
If you do not have a fever but still have trouble going to the bathroom, your digestion may be slow because of your habits or metabolism.
Common Culprit and How it Affects Digestion
Low-Fiber Diet
Lacking whole grains and vegetables means your stool lacks the bulk to move efficiently.
Medication Side Effects
Opioids, antidepressants, and iron supplements are notorious for slowing gut motility.
Physical Inactivity
Sitting for long periods slows down the muscle contractions in your intestinal tract.
Pelvic Floor Dysfunction
Weakened pelvic muscles fail to contract properly to push stool out of the rectum.
Hormonal Shifts
Pregnancy or thyroid diseases (hypothyroidism) disrupt the hormones that regulate digestion.
When to See a Doctor
Do not try to diagnose yourself if you have severe stomach pain. Occasional constipation is normal, but if you also have signs of infection, it is a serious warning sign. Seek urgent medical care if you have constipation and fever along with any of these warning signs:
A high fever exceeding 101°F (38.3°C)
Severe, debilitating abdominal pain (especially if it hurts when you press on it and release)
Blood in your stool (either bright red blood or dark, tar-like stools)
Persistent vomiting or the inability to keep liquids down
A complete inability to pass gas
Dizziness or confusion (signs of severe infection or dehydration)
Conclusion
To recap: can you get a fever from constipation? No. But since both can be caused by serious problems like appendicitis, diverticulitis, or infections, you should take them seriously if they happen together.
If your temperature is above 101°F and you have severe stomach pain, do not use home remedies or over-the-counter laxatives. Contact your doctor immediately. It might require a CT scan, abdominal X-ray, or blood tests to find exactly what is causing the infection or blockage.
But if your doctor says you do not have a serious problem, you can feel better by drinking plenty of water, eating high-fiber foods, and getting some light exercise to help your digestion.
Frequently Asked Questions
Can you get a fever from constipation?
No, constipation itself does not cause a fever. Constipation is a mechanical issue in your digestive tract, while a fever is your immune system’s response to an infection. If you have both, an underlying condition like a gastrointestinal infection, appendicitis, or diverticulitis is likely causing them simultaneously.
Can a fever cause constipation?
Yes, a fever can indirectly cause constipation. When you run a fever, your body sweats and loses fluids rapidly. If you do not drink enough water, this dehydration causes your colon to pull moisture directly from your stool, making it hard and difficult to pass.
Does constipation cause a fever in babies and toddlers?
No, just like in adults, constipation does not cause a fever in babies. However, when children are sick with a fever, they often refuse to drink fluids. This rapid dehydration dries out their stool, leading to temporary constipation.
When should I go to the ER for a fever and stomach pain?
Seek emergency medical care immediately if your fever exceeds 101°F (38.3°C) and is accompanied by severe abdominal pain, blood in your stool, persistent vomiting, or a complete inability to pass gas. These are red flags for serious conditions like a ruptured appendix or bowel obstruction.
Sources & References
- What Does Appendicitis Pain Feel Like? A Guide to Early Detection. Summit Health.
- How time affects the risk of rupture in appendicitis. Bickell NA, et al. J Am Coll Surg. 2006.
- Ruptured Appendix. Healthline.
- Fever Chart Guide – When to Go to the ER. CHOC Children’s.
- Fever in Children. Boston Children’s Hospital.
- Infant Fever Clinical Practice Guideline. American Academy of Pediatrics.
