There are two basic types of SIBO: hydrogen dominant (diarrhea) and methane dominant (constipation). I was diagnosed with SIBO in 2018 without definitive type but based on my constipation and slow gut motility, I've assumed and use treatments for methane dominant.

Oh sorry, actually I just found out that SIBO can be caused by either bad bacteria or too much good bacteria, so depending on which kind someone has, probiotics might either help or hurt. Yep, diarrhea, constipation, bloating, vitamin deficiencies, those are the main symptoms of SIBO, but if it gets bad enough it can also cause more bizarre stuff like brain fog, joint pain, or acne. Acne happens when the bacteria damage the gut lining (leaky gut) and get absorbed into the bloodstream and then cause skin breakouts.