Diverticulosis and Diverticulitis Symptoms, Causes and Treatments

Diverticular disease refers to conditions that affect the large intestine, particularly the colon, where small, bulging pouches called diverticula form. Many people develop diverticula as they age, and for most, these pouches cause no problems. For some, however, these pouches can sometimes become inflamed or infected, leading to a more serious condition known as diverticulitis. Understanding the difference between diverticulosis and diverticulitis is key to managing your digestive health.

Diverticulosis: A Common Condition

Diverticulosis is a very common condition where small, balloon-like pouches, known as diverticula, develop in the wall of the large intestine, most often in the sigmoid colon, which is the lower part of the colon. Imagine tiny pockets forming on the outside of the colon wall.

For many individuals, diverticulosis itself is harmless. It often goes unnoticed because it typically doesn't cause any symptoms. This means that many people have diverticulosis without even knowing it, discovering it only during tests for other conditions, such as a colonoscopy.

Diverticulosis Is Not Serious

Generally, diverticulosis is not considered a serious condition on its own, especially if it doesn't cause symptoms. It’s a common finding, particularly as people get older. While it is not usually life-threatening, it does carry the potential risk of developing into diverticulitis, which is the more serious complication.

Sometimes, diverticulosis may cause mild, non-specific symptoms such as bloating, gas or changes in bowel movements like constipation or, less commonly, diarrhea. These symptoms can often be managed through simple dietary changes.

How Diverticula Form

Diverticula are thought to form due to a combination of factors that weaken the colon wall and increase pressure within the large intestine.

• Weak spots in the colon wall: Over time, usually due to aging, certain areas of the colon wall can become naturally weaker.
• Pressure inside the colon: Straining during bowel movements, often due to chronic constipation, can create high pressure within the colon. This pressure can cause the inner lining of the colon to push through these weak spots, forming the small, outward-bulging pouches.

Causes of Diverticulosis

Several risk factors contribute to the development of diverticulosis and its progression to diverticulitis.

• Lack of dietary fiber: This is considered a primary cause. A diet low in fiber (from foods like whole grains, fruits and vegetables) can lead to hard, dry stools and constipation. This forces the colon to work harder to move stool, increasing pressure within the colon and contributing to the formation of diverticula.
• Age: Diverticulosis is more common in older adults. About half of people over 60 have diverticulosis, and nearly all people over 80 have it.
• Obesity: Being overweight or obese increases the risk of developing diverticular disease and diverticulitis.
• Lack of exercise: Physical inactivity can contribute to constipation and other digestive issues, potentially increasing risk.
• Smoking: Smokers have a higher risk of developing diverticulitis.
• Certain medications: Regular use of nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen and naproxen, opioids and steroids can increase the risk of diverticulitis and its complications.
• Dietary habits: While a low-fiber diet is strongly linked, some research suggests that a diet high in red meat may also increase the risk of diverticulitis.
• Genetics: There may be a genetic predisposition, meaning if close family members have diverticular disease, you might be at a higher risk.

Diverticulitis Results From Inflammation

Diverticulitis occurs when one or more of these diverticula become inflamed or infected. This can happen if stool or undigested food gets trapped in a pouch, leading to irritation, bacterial overgrowth and inflammation. It's important to understand that while diverticulosis refers to the presence of the pouches, diverticulitis refers to the acute inflammation or infection of those pouches.

Causes of Diverticulitis

The direct cause of diverticulitis is typically when a diverticulum becomes blocked, leading to bacterial growth and inflammation. This blockage can be from small pieces of stool or undigested food. The pressure and irritation inside the pouch can then lead to a tear in the thin wall of the diverticulum, allowing bacteria to spread and causing infection.

Several factors can trigger diverticulitis flare-ups, including a low-fiber diet, which can lead to constipation and increased pressure in the colon. Other potential triggers include certain medications, especially nonsteroidal anti-inflammatory drugs (NSAIDs), and lifestyle factors like obesity and smoking.

Stages of Diverticulitis

Diverticulitis ranges in severity from mild to complicated.

• Uncomplicated diverticulitis: This is the most common form, characterized by inflammation without serious complications. Symptoms are usually manageable at home with medication and diet. This is often considered "stage 1" in some informal classifications, indicating a localized inflammation without major issues.
   
• Complicated diverticulitis: This involves more serious issues, such as an abscess (a pus-filled pocket), perforation (a hole in the colon wall), a fistula (an abnormal connection between two organs) or bowel obstruction. These complications often require hospitalization and potentially surgery.

How Long a Diverticulitis Attack Lasts

The duration of a diverticulitis attack can vary. Mild, uncomplicated cases may resolve within a few days to a week with proper treatment, such as antibiotics and a liquid diet. More severe attacks or those with complications can last longer and require more intensive medical care, including hospitalization. Even after the acute symptoms subside, it may take several weeks for the colon to fully heal.

Symptoms of Diverticulosis and Diverticulitis 

While diverticulosis often presents without symptoms, diverticulitis causes distinct and often painful warning signs.

Common Symptoms of Diverticulosis

As mentioned, diverticulosis typically has no symptoms. However, some individuals with diverticulosis might experience mild, non-specific gastrointestinal issues, such as:

• Bloating
• Gas
• Occasional abdominal cramps
• Changes in bowel habits, such as constipation. Bowel movements with diverticulosis, if symptoms are present, might lean toward constipation due to the lack of fiber.

These symptoms are usually not severe and are often mistaken for other common digestive complaints.

Warning Signs of Diverticulitis

When diverticula become inflamed or infected, the symptoms become more pronounced and often indicate a need for medical attention. These warning signs include:

• Abdominal pain: This is the most common and often severe symptom. The pain typically occurs in the lower left side of the abdomen, where the sigmoid colon is located. It can be constant and last for several days, or it may start suddenly and worsen over time. Sometimes, the pain can be felt on the right side, especially in people of Asian descent.
• Fever and chills: An elevated body temperature often accompanies an infection or inflammation.
• Nausea and vomiting: Digestive upset is common during an attack.
• Changes in bowel habits: This can manifest as severe constipation, which might worsen the condition, or sometimes diarrhea.
• Abdominal tenderness: The affected area of the abdomen may be very tender to the touch.
• Rectal bleeding: While less common, diverticular bleeding can occur if a small blood vessel in the wall of a diverticulum ruptures. This can range from small amounts of blood in the stool to significant bleeding. Rectal bleding requires immediate medical attention.

Other Conditions Often Mistaken for Diverticulitis

Because diverticulitis symptoms, particularly abdominal pain, can overlap with other conditions, it's crucial to get a proper diagnosis from a health care professional. Conditions that can be mistaken for diverticulitis include:

• Irritable bowel syndrome (IBS)
• Appendicitis (especially if the pain is on the right side)
• Colon cancer
• Kidney diseases or kidney stones
• Urinary tract infections (UTIs)
• Inflammatory bowel disease (Crohn's disease or ulcerative colitis)
• Gynecological issues in women

Always consult a doctor if you experience severe abdominal pain or other concerning symptoms.

When to Seek Medical Attention

While diverticulosis often goes unnoticed, and mild diverticulitis can sometimes be managed at home, it's crucial to know when to seek professional medical help. You should contact your care team immediately if you experience:

• Severe or sudden abdominal pain, especially if it's new or worsening.
• Fever along with abdominal pain.
• Nausea and vomiting that prevents you from keeping liquids down.
• Rectal bleeding, especially significant amounts.
• Changes in bowel habits, such as severe constipation or diarrhea, accompanied by other symptoms.
• Any symptoms that concern you or seem to indicate a serious problem.

Early diagnosis and treatment can prevent complications and lead to better outcomes

Diagnosing Diverticulosis and Diverticulitis

When symptoms suggest diverticular disease, a health care professional will conduct tests to confirm the diagnosis and determine the severity of the condition.

Initial Assessment

The diagnostic process usually begins with a thorough medical history and a physical examination. The doctor will ask about your symptoms, medical background and diet. During the physical exam, they may gently press on your abdomen to check for tenderness, particularly in the lower left side.

Blood Tests 

Blood tests are often performed to check for signs of infection or inflammation. A high white blood cell count can indicate an infection, which is common in diverticulitis. Other blood tests might assess overall health and rule out other conditions.

Imaging Tests

Imaging tests are crucial for visualizing the colon and identifying diverticula or signs of inflammation. 

• CT scan: This is the most common and effective imaging test for diagnosing diverticulitis. A CT scan can clearly show inflamed or infected diverticula, and also help identify complications such as abscesses, perforations (holes), or fistulas. It helps determine the severity of the attack and guides treatment decisions.
• X-ray: While not as detailed as a CT scan for diagnosing diverticulitis itself, X-rays may be used to look for signs of a perforated bowel or bowel obstruction, especially in emergency situations.
• Ultrasound: An abdominal ultrasound may be used in some cases to help diagnose diverticulitis or rule out other abdominal conditions.

Colonoscopy

A colonoscopy involves inserting a thin, flexible tube with a camera into the rectum to view the inside of the entire colon.

• For diverticulosis: A colonoscopy is the definitive way to diagnose diverticulosis, as it allows the doctor to directly see the presence of diverticula in the colon wall.
   
• For diverticulitis: A colonoscopy is generally not performed during an acute diverticulitis flare-up due to the risk of perforating the inflamed colon. However, it is often recommended after an attack has resolved (typically 6-8 weeks later). This is important to confirm the diagnosis, assess the extent of the diverticula and most importantly, to rule out other serious conditions like colon cancer, which can have similar symptoms.

Treatment Options for Diverticular Disease

Treatment for diverticular disease depends heavily on whether you have asymptomatic diverticulosis or an acute case of diverticulitis, and its severity.

Diverticulosis Treatment

Since diverticulosis typically causes no symptoms, it often requires no specific medical treatment. The main focus is on preventing the development of diverticulitis and managing any mild, non-specific symptoms. The primary recommendation is a high-fiber diet and ample hydration.

What to Eat for Diverticulosis

The most important lifestyle change for diverticulosis is adopting a high-fiber diet.

• High-fiber diet: Gradually increase your intake of fiber-rich foods such as whole grains (whole-wheat bread, oats, brown rice), fruits (berries, apples, pears), vegetables (broccoli, spinach, carrots) and legumes (beans, lentils). Fiber adds bulk to stool, making it softer and easier to pass, which reduces pressure in the colon.
• Consider a Mediterranean-style diet: Emphasize whole, anti-inflammatory foods such as fruits, vegetables, whole grains, legumes, nuts, olive oil and lean proteins like fish and poultry. This dietary pattern may help reduce inflammation and support gut health. Avoid highly processed foods, added sugars and artificial ingredients, which can aggravate symptoms and disrupt the gut microbiome.
• Hydration: Does drinking a lot of water help diverticulosis? Yes, drinking plenty of water is crucial. Water helps fiber work effectively, preventing constipation and ensuring smooth bowel movements. Aim for at least 8 glasses of water daily.

For any mild discomfort or irregular bowel movements associated with diverticulosis, the high-fiber diet and adequate water intake are the main "calming" factors. Regular physical activity also promotes healthy bowel function. These strategies help prevent the condition from progressing to diverticulitis.

Diverticulitis Treatment

The treatment for diverticulitis depends on its severity:

Treating Uncomplicated Diverticulitis (Mild Cases)

Most cases of diverticulitis are uncomplicated and can be managed at home.

• Bowel rest: Your doctor will likely recommend a liquid diet for a few days to rest your colon. This includes clear broths, water and clear juices. As symptoms improve, you can slowly reintroduce low-fiber foods (like white rice, plain pasta, soft cooked vegetables without skins) and then gradually transition back to a high-fiber diet.
• Oral antibiotics: If an infection is suspected, your doctor will prescribe antibiotics to clear it.
• Pain relievers: Over-the-counter pain relievers like acetaminophen can help manage discomfort. NSAIDs are generally avoided as they can worsen the condition or increase complication risk.

Treating Severe Diverticulitis and Complications

For more severe cases of diverticulitis or if complications arise, hospitalization is often necessary.

• Intravenous (IV) antibiotics: You may receive antibiotics directly into a vein.
• Bowel rest with IV fluids: You might be put on complete bowel rest, meaning no food or drink by mouth, with nutrition and hydration provided through IV fluids.
• Abscess drainage: If a pus-filled abscess forms, it may need to be drained. This can sometimes be done using a needle guided by a CT scan (percutaneous drainage), or it might require surgical intervention.

Surgery: Bowel Resection/Colectomy 

For severe diverticulitis and its , we can remove the part of the colon containing the inflammation and its complications. Surgery may be necessary to treat the following:

• Perforation: A hole in the colon wall that leads to infection in the abdominal cavity (peritonitis), a life-threatening condition.
• Abscesses: Large abscesses that cannot be drained non-surgically.
• Fistula: An abnormal connection between the colon and another organ, such as the bladder or vagina.
• Bowel obstruction: Blockage of the colon.
• Recurrent severe attacks: If you experience frequent, severe attacks that significantly impact your quality of life.

During a bowel resection (also called a colectomy), the diseased section of the large intestine (often the sigmoid colon) is removed, and the healthy ends are reconnected. Sometimes, if the inflammation is too severe, a temporary colostomy may be performed, where a part of the colon is brought through an opening in the abdomen to allow waste to exit into a bag, giving the colon time to heal before a second surgery to reconnect it.

Lifestyle and Prevention

Even if you've been diagnosed with diverticulosis or have recovered from diverticulitis, lifestyle changes are essential for preventing future flare-ups and maintaining digestive health.

Diet for Prevention and Management

Diet plays a crucial role in managing diverticular disease.

• High-fiber diet: This remains the cornerstone of prevention and management. Increase your intake of dietary fiber gradually to allow your digestive system to adjust. Excellent sources include:
  • Whole grains: Whole-wheat bread, brown rice, oats, quinoa, barley.
  • Fruits: Apples (with skin), pears, berries, prunes, oranges.
  • Vegetables: Broccoli, spinach, carrots, brussels sprouts, squash.
  • Legumes: Beans (kidney, black, pinto), lentils, chickpeas.
• Stay hydrated: Drink plenty of water throughout the day. This is vital for helping fiber move through your digestive system smoothly and preventing constipation.
• Limit red meat: Some studies suggest that a high intake of red meat may increase the risk of diverticulitis. Consider reducing your consumption of red and processed meats.

Dispelling Diverticulitis Diet Myths

For many years, it was believed that people with diverticular disease should avoid nuts, seeds and corn, as it was thought they could get stuck in the diverticula and cause inflammation. Current research does not support this claim. Most studies show that these foods do not increase the risk of diverticulitis and can be part of a healthy, high-fiber diet. Always discuss specific dietary concerns with your health care professional.

Other Lifestyle Factors

Beyond diet, other lifestyle choices can significantly impact your risk.

• Regular exercise: Physical activity promotes healthy bowel function and can help prevent constipation, reducing the risk of diverticulitis. Aim for at least 30 minutes of moderate exercise most days of the week.
• Maintain a healthy weight: Obesity is a known risk factor for diverticulitis. Working toward and maintaining a healthy body weight can help reduce your risk.
• Quit smoking: Smoking increases the risk of many digestive issues, including diverticulitis. Quitting smoking is beneficial for overall health.
• Limit NSAIDs: If possible, try to limit the use of nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen, as they can increase the risk of diverticulitis and its complications. Discuss alternative pain relief options with your doctor.