Āveṇikasutta

Suttapiṭaka · Saṁyuttanikāya · Saḷāyatanavaggasaṁyutta · Vol. 18 · Section 463

[463] Furthermore, bhikkhus, a woman (mātugāma) is subject to the menstrual cycle. This, bhikkhus, is the second suffering (dukkha) particular to a woman, which a woman experiences apart from men.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.