Amenorrhoea is a condition in which the regular monthly flow is suspended. It is not a disease of itself, being simply a symptom of some disorder of the uterine organs. The conditions from which it may arise are various. In pregnancy, menstruation is usually suspended, although in exceptional cases the regular monthly flow continues. There is some discussion, however, whether in these cases the loss of blood is the true monthly menstrual flow. Menstruation is also usually suspended during nursing, although the function is not infrequently resumed two or three months after childbirth. Imperfect development of the reproductive organs and obstruction of the uterus or the vagina are conditions which occasionally give rise to amenorrhoea. When a mechanical obstruction exists, there is generally enlargement of the abdomen from accumulation of the menstrual fluid. Sudden suppression of menstruation is generally due to taking cold during the menstrual period, or sudden mental shock. When it occurs suddenly in this way, the patient generally complains of pain in the back, headache, fever, and other unpleasant symptoms. We have noticed also, in some cases, temporary suspension of the menstrual flow in consequence of a change in diet, in which persons who had been accustomed to a stimulating diet, consisting largely of animal fat, including a free use of stimulating condiments, suddenly discontinued the use of these articles. In these cases, however, we have never observed any impairment of the general health; in fact, in the majority of cases there has been improvement in the general health notwithstanding the suppression of this function. In the course of a few months the function appears again, though as a general rule the flow is somewhat less profuse than before. We have observed a few peculiar cases of suppression of menstruation in which the patient suffered at the times when menstruation should appear, with peculiar nervous symptoms closely resembling a slight epileptic attack.

Patients suffering with amenorrhoea are frequently subject at the time when the menstrual flow should make its appearence to hemorrhage in various parts of the body, as from the nose, lungs, stomach, bowels, etc. Some cases have been observed in which bloody-sweat appeared at these times. These hemorrhages are sometimes termed vicarious menstruation.