Amenorrhoea is common during convalescence from acute diseases; it is also a result of chronic diseases of the liver, stomach, intestines, kidneys, and especially of the lungs; it complicates anaemia, malaria, rheumatism, and other general pathological conditions. Fright, grief, great anxiety, mental shock cause amenorrhoea; so do homesickness and many forms of insanity.
There are also local causes of this condition: imperfect development of the uterus or the organs connected therewith, and inflammations of these organs or of the pelvic wall.
Opposed to amenorrhoea is menorrhagia, or an excessive menstrual flow. Metrorrhagia, or hemorrhage from the uterus at any time, is a term confounded with menorrhagia, which is an inordinate menstrual loss of uterine blood, but the distinction is not important. Menorrhagia and metrorrhagia commonly have an identical cause and they frequently coexist. They are found in chronic diseases of the heart, lungs, liver, and other organs; they are an outcome of prolonged lactation, and of local affections of the uterus and its appendages. Any condition also that deranges the blood may cause menorrhagia or metrorrhagia; so do malignant tumours of the uterus, uterine displacements, lacerations that [{242}] occur in childbirth, and psychical influences, as fright, anxiety, and other strong emotions.
Dysmenorrhoea, difficult or obstructed menstruation, is a term used for menstruation accompanied by pain. This is a common menstrual derangement, and it may be neuralgic or inflammatory in origin, or it may be caused by obstruction to the menstrual flow. There is another variety of dysmenorrhoea, called membranous, in which the superficial layer of the uterine lining is cast off partly or wholly.
In the neuralgic form the uterus and its appendages are normal in appearance, but the pain recurs monthly, and it may have degrees from mere discomfort to agony. This form is characterised by reflex headache, sympathetic nausea or vomiting; and the pain may not be confined to the uterus and its appendages. The irritation often brings out latent hysterical phenomena, spinal irritation, and neurasthenia. Rheumatism and gout are predisposing causes, so are indolence, lack of physical exercise, light clothing in cold weather, forced school work and similar depressing agents.
In the neurotic variety of dysmenorrhoea pain often persists after the menstrual flow has set in, but in inflammatory dysmenorrhoea the flow relieves the pain or removes it. Marriage commonly removes the neurotic form of dismenorrhoea.
In obstructive dysmenorrhoea the menstrual fluid is retained by narrow or tortuous outlets, flexions of the uterus, and similar causes. The prognosis is good in all forms of dysmenorrhoea, but frequently long and skilful treatment is required to cure such conditions, especially the membranous form. Inflammatory, obstructive, and membranous dysmenorrhoea are commonly made worse by marriage.
At the end of the childbearing period menstruation gradually ceases. In temperate climates this menopause occurs about the forty-fifth year, but it may come earlier or considerably later. Work that keeps a woman in a heated atmosphere, as cooking, washing, and baking, disturbs menstruation and tends to advance the menopause. Workers in chemical factories, in badly ventilated rooms, or women that do heavy labour in the open air, are apt to age prematurely, and have [{243}] an early menopause or "change of life." This premature climacteric is found also in women that bear many children in rapid succession.
At the menopause there may be various physical or mental disturbances which are probably due more to the somewhat abrupt advent of old age, at the cessation of the childbearing part of life, rather than to the menopause itself. It is a fact, however, that often profound disturbances coincide with the climacteric, and we know no sufficient cause for them if the menopause itself may not be deemed such.
There are numerous disorders of the nervous system in women which are dependent directly or indirectly upon a derangement of the pelvic organs. Distant parts of the body are affected pathologically through sympathetic irritation when the primary disease is in the pelvic organs, and direct treatment of the pelvic trouble alone cures these reflex conditions. The very common disorders of pregnancy, the marked physiological changes in women at the beginning of menstruation with puberty, and its cessation with the menopause, are among the first proofs of this assertion that occur. Menstruation may aggravate goitre, uterine fibroid tumours, skin diseases, and affections of the blood vessels. Disordered menstruation causes sleeplessness, melancholy, dementia, and mania, by affecting the brain; it may bring on local paralysis; start up latent epilepsy; excite reflex cough and difficulty in breathing; make the heart irritable; cause nausea, vomiting, dyspepsia, flatulence, diarrhoea, skin-inflammations, pain in the joints, and many other symptomatic phenomena.