Belly/digestion plays up before, or during a period.
Lack of ingredients needed to run your body and the menstrual cycle.
Maybe as simple as a lack of magnesium, iodine (to allow your gut to even work well) and pure water, and good gut bacteria.
Look to the role of the Liver Qi in all digestion/circulation, emotions and reproductive issues.
May have low thyroid function – usually due to presence of heavy metals and not enoughiodine/excess heavy metals will start this off
Eat only when hungry and not when uset.
Do not eat what is aggravating your conditions.