H. Pylori is a bacteria that can cause an infection in the stomach and the small intestine. It commonly causes inflammation of the stomach as well as peptic ulcer disease. H. Pylori infections can lead to certain types of stomach cancer. A meta analysis was conducted to determine if there was a relationship between migraine and H.Pylori.
The study found that there is a positive connection between migraine and H.Pylori (44.97% compared to 33.26% in the control group ).1
Other studies found that once the infection was treated, migraine attacks significantly reduced.