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Dr. Craig Mortensen Dr. Craig Mortensen

SIBO Types, treatment and warnings

SIBO can manifest with a range of digestive and systemic symptoms due to the fermentation of food by excess bacteria in the small intestine. The most common symptoms include:

Digestive Symptoms:

  • Gas (Flatulence & Belching) – Caused by excess hydrogen, methane, or hydrogen sulfide production.

  • Diarrhea – More common in hydrogen-dominant SIBO, as bacteria pull water into the intestines.

  • Constipation – More frequent in methane-dominant SIBO, as methane slows gut motility.

  • Abdominal Pain & Cramping – Due to inflammation and gas buildup.

  • Nausea & Acid Reflux – SIBO can impact stomach acid levels and digestion.

Malabsorption & Nutrient Deficiencies:

  • Vitamin B12 Deficiency – Bacteria consume B12, leading to fatigue and brain fog.

  • Iron Deficiency Anemia – Due to impaired absorption.

  • Fat Malabsorption – Bacteria interfere with bile, causing greasy stools and nutrient loss.

  • Weight Loss or Gain – Some experience malnutrition-related weight loss, while others have weight gain due to inflammation.

Systemic Symptoms:

  • Brain Fog & Fatigue – Toxins from bacteria can affect brain function.

  • Joint Pain & Inflammation – Due to increased gut permeability (leaky gut).

  • Skin Issues – Rosacea, eczema, and acne can be linked to SIBO-related inflammation.

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