"Bacterial overgrowth" refers to an excessive increase in the number of bacteria in a certain area of the body. It means that there are more bacteria than what is normally present, which can cause health issues. Full definition
Small intestinal bacterial overgrowth in irritable bowel syndrome: a systematic review and meta - analysis. (empoweredautoimmune.com)
And this is something that I'm actually looking into quite a bit right now for a few clients is this small intestine bacterial overgrowth issue. (bengreenfieldfitness.com)
NOTE: The body has several protective measures that prevent bacterial overgrowth in the small intestine. (ancestralsupplements.com)