Why does my vagina become irritated before my cycle?

Hormones: The natural fluctuations in estrogen and progesterone levels that are responsible for your cycle also can create these disturbances that result in itchiness or feelings of dryness, etc. It might help if you take a daily probiotics, avoid using perfumed soaps and wipes and use a lubricant like RepHresh or Replens. You could also do nothing at all unless it is problematic..