Itching that flares specifically around your periods is usually a yeast infection. The vaginal pH shifts during menstruation, and warmth plus moisture from pads makes it worse at night. Scratching breaks the skin and makes the itching and irritation worse, even though it feels like the only relief in the moment.
Next Steps
Change pads every 3 to 4 hours during your period, wear loose cotton underwear, and avoid scented soaps or washes down there. See a gynaecologist before your next period so you can start the right antifungal treatment and stop this cycle from repeating.
Health Tips
Stop scratching, since broken skin can get infected. If you notice thick discharge, odour or swelling, get it checked sooner rather than waiting.