Question: what are symptoms of bad gut bacteria?
Answer: Upset stomach. Stomach disturbances like gas, bloating, constipation, diarrhea, and heartburn can all be signs of an unhealthy gut. ... 
A high-sugar diet. ... 
Unintentional weight changes. ... 
Sleep disturbances or constant fatigue. ... 
Skin irritation. ... 
Autoimmune conditions. ... 
Food intolerances.