Apo kōpēs eis to bēma

orum the menses occurs either by a vice of the matter itself, or of the parts themselves.

XVI.
If by a vice of the matter, it is faulty either in its quantity or its quality.

XVII.
In quantity, in defect or in abundance: and if it is deficient, this happens either simply or in a certain respect.

XVIII.
Simply, when the blood is not generated. In a certain respect, when it is generated indeed, but makes an attack upon other parts.

XIX.
Blood is not generated due to errors that are either internal or external.

XX.
Internal, either by reason of the whole or the part. Of the whole, such as an intemperance a humoral imbalance that is either innate or acquired: of the hotter sort, which consumes the blood: of the colder sort, as in old age: or of the hot and dry, or cold and dry sort, as happens in certain diseases.

XXI.
Of the part, indeed, as in long-standing ills of the stomach, liver, chest, and lung: for heat is weakened in such a way that the menstrual blood is not generated.

XXII.
External errors include excessive exercise, hunger, accidents of the soul emotional distress, obesity, and others.

XXIII.
Blood is deficient in a certain respect when it inclines toward other parts: which happens when the remaining parts suffer from weakness, from which they easily receive it: or when they draw it, such as a hemorrhage of the nose, a flow of hemorrhoids, vomiting, etc.