Theses de suppressis mensibus

XIX.
You will infer this itself from the fact that it brings no annoyance or harm to the woman.

XX.
It happens, however, mostly by reason of age. For just as they begin to flow for young girls for the most part in the fourteenth year (very few break out before the thirteenth or twelfth, most after the fourteenth), so in turn they cease to flow for those of advanced age; for some in the 50th, for others in the 55th, for very few in the 60th year.

XXI.
They are also suppressed naturally in those who are pregnant and those who are nursing: for in the former, the blood yields to the nourishment of the fetus conceived in the uterus: in the latter, however, it is transmitted through common veins to the breasts and is transmuted into milk by the force of the glands.

XXII.
By equal reason, women of a hotter temperament and using valid exercises, such as dancers and countrywomen, are purged little or not at all, since whatever superfluous blood is in them is consumed by the valid heat.

XXIII.
And this natural retention seems to be subjected to theory rather than to medical Practice.

XXIV.
The Menses retained against nature, however, pertain to the Physician in either way: whether it happens by the vice of the uterus itself and the vessels, or by reason of the matter: and both either by itself or by consent sympathy between organs.