What Does a Diverticulitis Attack Feel Like?

When there are small outpouchings in the wall of the colon (large intestine), it is called diverticular disease. The pouches are called diverticula. They are common in people over the age of 50 years. They’re thought to occur after the colon wall becomes weak in certain places.

Most people don’t even know they have diverticula because they don’t usually cause symptoms. But in some cases, diverticula can become inflamed and cause symptoms such as pain, bleeding, diarrhea, or vomiting. This is called diverticulitis.

This article will describe what diverticulitis might feel like, other conditions that have similar symptoms, what may help in avoiding a flare-up, and what to do when one occurs. 

Woman feeling lower left abdominal pain which could be diverticulitis

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Diverticulitis Pain

Abdominal pain is a common symptom of diverticulitis. It might be felt in the lower left quadrant of the abdomen, the lower right quadrant, or at the pubic bone. The pain might come and go or be constant. 

The abdomen might also feel tender to the touch in some areas.

Other Diverticulitis Symptoms

The symptoms of diverticulitis can be similar to many other common digestive problems. Some of the symptoms can include:

  • Abdominal discomfort or pain
  • Bloating
  • Constipation
  • Diarrhea
  • Fever
  • Loss of appetite
  • Nausea
  • Mucus in the stool  
  • Urinary frequency
  • Vomiting

When to See a Healthcare Provider

People may or may not know if they have diverticular disease. For those who know they have diverticula, it is important to see a healthcare provider if symptoms seem like they could be from diverticulitis. 

However, because most people don’t know if they have diverticula, it may be difficult to decide when to see a healthcare provider. Sharp abdominal pain or bleeding from the rectum are always reasons to seek care as soon as possible.

When the symptoms are more subtle, it could be more challenging to know it’s time to see a healthcare provider. However, if constipation, diarrhea, vomiting, or fever have gone on for more than a few days, that’s also a time to talk to a healthcare provider. 

Sharp abdominal pain, fainting, feeling confused, bleeding that doesn’t stop, or being unable to keep any food or water down are reasons to get care right away in an emergency department.

It’s important to have diverticulitis evaluated and treated. Without treatment, there could be complications such as anemia (a low number of healthy red blood cells) from blood loss, perforation (the contents of the large bowel leaking into the abdomen), peritonitis (infection of the abdominal cavity lining), abscesses (pockets of infection), or bowel obstruction.

Diverticulitis Diagnosis

A diagnosis of diverticulitis might be made using different tests. What tests are used will depend on what’s available, what insurance will cover, and how severe the symptoms are. Also, because the symptoms of diverticulitis are similar to many other conditions, it’s important to rule those things out. 

First, your history and report of symptoms will be taken. This includes questions about how much pain is present, where the pain is located, if there is bleeding, diarrhea, or constipation, and any other symptoms that might be occurring. Based on the evaluation of these symptoms, there might be a need to order some tests.

Some of the tests that may be used in the diagnostic process include: 

  • Blood tests: A blood test might show if there are more white blood cells than there should be, which could mean an infection.
  • Colonoscopy: A colonoscopy (a flexible tube with a camera inserted through the rectum to view the colon) might not be used if it’s thought that there is a flare-up of diverticulitis. But it could be an option to look for diverticula, or it might be used several weeks after symptoms improve.
  • Computed tomography (CT) scan: This is a type of X-ray that’s used to see the organs in the abdomen in cross-section, including the large intestine. 
  • Magnetic resonance imaging (MRI): An MRI uses a strong magnet to create images of the abdominal organs.
  • Stool tests: Diverticulitis won’t be diagnosed with just a stool test, but the stool will be tested for an infection or other conditions that can cause symptoms.
  • Ultrasound: An ultrasound is a type of test that uses sound waves to make an image of the organs inside the abdomen. 

Preventing a Flare-up

It’s not known exactly what causes diverticular disease. However, quitting smoking, eating as healthy a diet as possible, and maintaining an appropriate weight are all recommended to try to avoid a flare-up or complications from diverticular disease.

Conditions Commonly Mistaken for Diverticulitis

Some of the symptoms of diverticulitis can be common with other conditions. For that reason, it’s important to be seen by a healthcare provider for abdominal pain and especially for bleeding from the rectum.

If it’s already known that a person has diverticula, diverticulitis might be suspected right away. But it’s important to know what is causing the symptoms so it can be treated and complications prevented.

Some of the conditions that might also be considered when diagnosing diverticulitis are:

Diverticulitis Treatment

Diverticulitis will be treated based on how serious it is and if there are any complications.

If symptoms are mild, diverticulitis could be treated at home. It might be recommended that a liquid diet be started for a few days. If symptoms get better, more foods might be added back into the diet.

For more serious symptoms, antibiotics might also be used along with the liquid diet. After seven to 10 days, the healthcare provider will make a decision about progress and give instructions on the next steps.

If the diverticulitis can’t be managed at home, hospitalization might be needed. This could include giving fluids and antibiotics intravenously (IV, through a line in a vein), as well as pain medication or other treatments as needed. 

In rare cases, surgery might be used. This could mean removing the part of the bowel with the inflamed diverticula. It could also mean creating an ostomy so stool is diverted away from the affected part of the bowel.

In an ostomy, a small part of the intestine is brought through the abdomen and an appliance is worn over it to collect bowel movements. It might be reversed later if the diverticulitis improves.

It’s now recommended that people with diverticular disease eat a high fiber diet and avoid too much red meat. Quitting smoking is also advised. Getting enough exercise and avoiding gaining weight might also be part of avoiding flare-ups of diverticulitis. A healthcare provider can help with giving more instructions on which of these lifestyle changes may be helpful.


Diverticular disease is common, especially as people get older. Most people don’t know they have diverticula but in some cases, these weakened areas in the colon can become inflamed and cause symptoms. Many people can be treated at home with a liquid diet, but others may need treatment in the hospital.

It’s important to have diverticulitis evaluated and treated, if needed. Without treatment, there could be complications that occur, such as anemia from blood loss, perforation (the contents of the large bowel leaking into the abdomen), peritonitis (infection of the abdominal cavity lining), abscesses (pockets of infection), or bowel obstruction.

A Word From Verywell

It can sound scary when diverticula are found during a routine colonoscopy. But for most people, there won’t be any symptoms or reason for concern. But if there is inflammation that causes pain or other symptoms, treatment might be needed either at home or in the hospital. Most people recover uneventfully and get back to their regular diet and activities.

Frequently Asked Questions

  • What can be mistaken for diverticulitis?

    There are many other conditions that have similar symptoms to diverticulitis. Some of the more common ones include appendicitis, hernia, inflammatory bowel disease (Crohn’s disease or ulcerative colitis), pain from ovulation, ovarian cyst, or pelvic inflammatory disease. 

  • What triggers diverticulitis flare-ups?

    It’s not fully understood what can cause a flare-up of diverticulitis. However, it’s recommended that people with diverticula eat a high fiber diet, get an appropriate amount of exercise, and not smoke.

  • Will diverticulitis go away on its own?

    Diverticulitis might resolve with treatment at home that includes a liquid diet. For some more serious symptoms, antibiotics or treatment in the hospital might be needed. It’s important to see a healthcare provider to understand what the best course of action is and what the treatment should be.

7 Sources
Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
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  2. Onur MR, Akpinar E, Karaosmanoglu AD, Isayev C, Karcaaltincaba M. Diverticulitis: a comprehensive review with usual and unusual complicationsInsights Imaging. 2017;8(1):19-27. doi:10.1007/s13244-016-0532-3

  3. National Institute of Diabetes and Digestive and Kidney Diseases. Diagnosis of diverticular disease.

  4. National Institute of Diabetes and Digestive and Kidney Diseases. Treatment for diverticular disease.

  5. Lamanna L, Moran PE. Diverticular disease. Gastroenterol Nurs. 2018;41:111-119. doi:10.1097/sga.0000000000000307. 

  6. Koprowski MA, Affleck A, Tsikitis VL. Emerging evidence and recent controversies in diverticulitis: a 5-year review. Ann Gastroenterology. 2022;35(1):8-16. doi:10.20524/aog.2021.0677 

  7. National Institute for Diabetes and Digestive and Kidney Diseases. Eating, diet, and nutrition for diverticular disease.

By Amber J. Tresca
Amber J. Tresca is a freelance writer and speaker who covers digestive conditions, including IBD. She was diagnosed with ulcerative colitis at age 16.