Causes of SIBO include:
Diets high in sugar, alcohol, and carbohydrates (which feed the bacteria)
Hypothyroidism, which can slow your metabolism and cause a build-up of bacteria in your small intestine
Low stomach acid, which leads to undigested food that feeds the bacteria
Certain medications that disrupt your microbiome, including antibiotics, birth control, acid-blocking drugs, and steroids
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Stress, which messes with your digestion and causes dysbiosis
Physical obstructions in the gut that can lead to an abnormal build-up of bacteria, such as diverticula or scarring from surgeries or Crohn’s disease
Dysmotility caused by diabetes, scleroderma, or neurological conditions such as Parkinson’s, ALS, or multiple sclerosis
