Understanding SIBO (Small Intestinal Bacterial Overgrowth): Causes, Symptoms, Diagnosis, and Treatment

SIBO, or Small Intestinal Bacterial Overgrowth, occurs when too many bacteria grow in the small intestine. Although bacteria are a normal part of digestion, having too many in the small intestine can upset digestion and nutritional absorption. Gastroenterology clinics work to identify and treat SIBO to help patients feel better and support gut health.


What Is SIBO?

SIBO happens when too many bacteria build up in the small intestine, which usually has fewer bacteria than the colon. These extra bacteria can disrupt digestion by fermenting food earlier than usual.

 

This may cause symptoms such as gas, inflammation, and difficulty absorbing nutrients. SIBO is often connected to other digestive problems, slow gut movement, or changes in gut structure.


Common Causes of SIBO

Many things can raise the risk of SIBO. Often, it develops because of a mix of digestive changes rather than just one cause.

 

Common causes include:

Slowed intestinal motility, allowing bacteria to grow and accumulate

Structural abnormalities in the small intestine

Previous gastrointestinal surgery

Chronic conditions such as IBS or diabetes

Low stomach acid, which normally helps control bacterial growth

Long-term use of certain medications that affect gut balance

Since SIBO often appears with other health issues, a complete medical check is important to get the right diagnosis.


Symptoms of SIBO

SIBO symptoms can be mild or severe and often look like those of other digestive problems, so testing is usually needed to find the cause.

Typical symptoms include:

Frequent bloating or abdominal distention

Excessive gas or belching

Abdominal discomfort or cramping

Diarrhea, constipation, or alternating bowel habits

Fatigue or low energy levels

Nutrient deficiencies, such as vitamin B12 deficiency

Unintended weight loss in more advanced cases

Many people find their symptoms get worse after eating, especially after meals with lots of carbohydrates.


How SIBO Is Diagnosed

Because SIBO symptoms can look like other gut problems, proper testing is important. Doctors usually start by asking about your symptoms, diet, medical history, and any medicines you take.

 

Diagnostic methods may include:

Hydrogen and methane breath testing

Blood tests to test for nutrient deficiencies

Stool testing in some cases

Evaluation for underlying conditions causing bacterial overgrowth

Breath tests are often used to find SIBO because they measure gases made by bacteria in the small intestine.


Treatment Options for SIBO

SIBO treatment aims to lower the extra bacteria, ease symptoms, and fix the root cause to help prevent it from coming back.

 

Common treatment approaches include:

Antibiotics or antimicrobial therapy

Dietary changes such as low FODMAP or modified carbohydrate intake

Prokinetic medications to improve intestinal movement

Probiotics, in some cases, can restore gut balance

Nutritional support to correct deficiencies

Treating underlying digestive conditions

Changing your diet and daily habits can be important for managing SIBO and keeping symptoms under control over time.



When to Seek Medical Care

If you keep having digestive symptoms, don’t ignore them. You should see a doctor if you notice:

Ongoing bloating or gas

Chronic diarrhea or constipation

Unexplained fatigue or nutrient deficiencies

Abdominal pain that affects daily life

Symptoms that do not improve with basic dietary changes

Early diagnosis and treatment can stop complications from occurring and boost digestive comfort. Finding and treating SIBO early can help you avoid problems and feel better with the right care plan. In gastroenterology practices, providers focus on identifying the root cause of symptoms and developing customized treatment plans to support long-term digestive health.

 

If you have symptoms of SIBO or ongoing digestive issues, making an appointment is a good first step to feeling better and improving your quality of life.

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At Northlake Gastroenterology Associates, esophageal manometry is an important diagnostic tool used to evaluate swallowing problems and esophageal function. This test helps measure what can’t be seen with standard imaging — how well the muscles in the esophagus are working. Have you ever felt like food gets stuck when you swallow? Or experienced chest discomfort, pain while eating, or ongoing heartburn that doesn’t improve with treatment? These symptoms can be frustrating and even concerning. While they may seem minor at first, they can be signs of a swallowing or esophageal disorder. To better understand what’s happening beneath the surface, doctors may recommend a specialized test called esophageal manometry. What Is Esophageal Manometry? Esophageal manometry is a test that measures the strength, coordination, and timing of muscle contractions in your esophagus. The esophagus is the muscular tube that moves food and liquid from your mouth to your stomach. For swallowing to work properly, these muscles must contract in a smooth, organized way. Unlike an X-ray or endoscopy, which show the structure of the esophagus, esophageal manometry focuses on how the muscles function. This makes it especially useful when patients have symptoms but normal-looking imaging results. Why Is This Test Important? Swallowing is a complex process that involves multiple muscles and valves working together. When even one part of this process isn’t functioning correctly, it can lead to uncomfortable or painful symptoms, including: Difficulty swallowing food or liquids A sensation of food getting stuck in the throat or chest Chest pain not related to the heart Ongoing heartburn or regurgitation Esophageal manometry allows gastroenterologists to identify problems with muscle movement, pressure, or coordination that may be causing these symptoms. Understanding the exact issue is essential for creating an effective treatment plan. 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By identifying these patterns, esophageal manometry helps doctors understand why symptoms are occurring and how best to treat them. What Happens During the Test? Esophageal manometry is typically performed as an outpatient procedure and does not require sedation. The test usually takes about 30 to 45 minutes. Here’s what patients can expect: A thin, flexible tube is gently passed through the nose and into the esophagus. Once the tube is in place, patients are asked to swallow small sips of water. Sensors along the tube measure muscle pressure and coordination during each swallow. The tube is removed once enough measurements are collected. While some patients experience mild discomfort or pressure in the nose or throat, the test is generally well-tolerated. Most people can resume normal activities shortly afterward. 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