Understanding SIBO: Symptoms, Causes & Natural Treatment Options of Small Bacterial Overgrowth

Small Intestinal Bacterial Overgrowth (SIBO) was extensively researched and outlined by Mark Pimentel, Director of the Gastrointestinal Motility Program at Cedars-Sinai Medical Center.

SIBO occurs when excessive bacteria—whether beneficial or pathogenic—accumulate in the small intestine.

While the large intestine is designed to house billions of bacteria that help eliminate waste and support overall health, the small intestine should contain relatively low levels of bacteria. When overgrowth occurs in this area, it can interfere with nutrient absorption and trigger inflammation.

Common Symptoms of SIBO

SIBO symptoms can vary from person to person but often include:

Because these symptoms overlap with other digestive disorders, proper testing is important before beginning treatment.

What Contributes to SIBO?

SIBO can develop for several reasons. One common trigger is food poisoning or gastroenteritis, which may disrupt normal gut motility.

Other contributing factors include:

  • Chronic stress
  • Recurrent food poisoning
  • Antibiotic use
  • Abdominal surgery
  • Chronic illness
  • Chronic constipation
  • Medications (especially proton pump inhibitors and acid blockers)
  • Impaired gut motility—the movement that sweeps bacteria out of the small intestine—is often a key underlying factor.

Natural Treatment Approach for SIBO

(After a Positive Test Result)

Treatment should always follow proper testing and guidance from a qualified healthcare practitioner. A typical natural protocol may include:

1. Antimicrobial Herbal Support (Approx. 6 Weeks)

Herbs commonly used include to reduce bacterial overgrowth:

  • Goldenseal
  • Olive leaf
  • Garlic
  • Thyme
  • Neem
  • Pau Darco

2. Dietary Modification

Restricting fermentable foods helps “starve” excess bacteria by limiting their fuel source. This often includes reducing:

  • Grains
  • Dairy
  • Sugars
  • Certain fermentable carbohydrates

After the treatment phase, foods can be gradually reintroduced if symptoms do not return.

A commonly referenced guideline is the Bi-Phasic Diet Protocol developed by the SIBO Test, which provides structured dietary phases and recipe ideas.

3. Supporting Gut Motility

Improving digestive movement helps clear bacteria and reduce recurrence. Herbs traditionally used to stimulate motility include:

  • Ginger
  • Peppermint
  • Dandelion
  • Bitter melon
  • Cinnamon

4. Biofilm Disruption

Bacteria can form a protective mucus layer (biofilm), making them harder to eliminate. Certain enzymes, such as N-acetyl cysteine (NAC), may be used alongside antimicrobials to improve effectiveness.

5. Gut Repair & Rebuilding

After reducing bacterial overgrowth, the focus shifts to:

  • Restoring beneficial gut flora
  • Repairing the digestive lining
  • Establishing long-term diet and lifestyle strategies

This stage is essential for maintaining results and preventing recurrence.

If you suspect SIBO, speak with your healthcare practitioner about appropriate testing and treatment options. For many people, addressing SIBO can significantly reduce digestive discomfort and restore energy and wellbeing. A targeted short-term protocol, followed by sustainable diet and lifestyle changes, can support long-term gut health and overall vitality.