Approximately 67%-80% of stomach ulcers, over 90% of stomach infections, and 95% of duodenal ulcers (the first part of the small intestine) are caused by the Helicobacter pylori (HP) bacteria.
Initially, HP bacteria cause chronic gastritis, which can then lead to stomach ulcers, gastric atrophy, and, in severe cases, stomach cancer.
Diarrhea, nausea, vomiting, and constipation are often caused by an imbalance in the gut microbiome