Can SIBO cause anxiety and panic attacks?

Yes, SIBO can directly contribute to anxiety and panic attacks through the complex brain-gut connection. Bacterial overgrowth in the small intestine damages the delicate gut lining, leading to increased intestinal permeability. This allows bacterial toxins, such as lipopolysaccharides (LPS) endotoxins, to translocate into the bloodstream. This translocation stimulates the immune system and triggers systemic inflammation. These inflammatory cytokines travel to the brain, where they alter neurotransmitter production—reducing calming GABA and serotonin while elevating excitatory glutamate. Furthermore, gut inflammation alters signals sent along the [vagus nerve gut motility](/vagus-nerve-gut-motility) pathway, which links the enteric nervous system directly to the brain's emotional center, triggering physical sensations of panic, palpitations, and generalized anxiety.

Disclaimer: This content is reviewed and fact-checked by Daryl Stubbs, Certified Holistic Nutritional Consultant (C.H.N.C), for educational purposes. It does not constitute medical advice or a doctor-patient relationship.