Amenorrhoea is the word used to describe the absence of menstruation for three months or more. At times, like before puberty, during pregnancy and breastfeeding, and after menopause, it is perfectly acceptable not to have periods. At other times it is a little unusual, although fairly common. Amenorrhoea can be ‘primary’ (never had a period), or ‘secondary’ (had them before, but they have stopped).
Oligomenorrhoea is related; it is when you have periods, but not very often. Oligomenorrhoea is defined as having a cycle longer than thirty-eight days, but less than three months (because if it was three months between periods, the doctors would call that amenorrhoea, but it’s all a bit academic, really).
Amenorrhoea and oligomenorrhoea are not diseases. They are symptoms, and may have a variety of causes. Oligomenorrhoea may be a ‘normal’ condition for some women who just have long cycles. More often it is due to an alteration in the pattern of the hormones, as is usually the case in secondary amenorrhoea.
Primary amenorrhoea can simply be due to late puberty. If there arc no periods by the time a girl has reached 16 or 17 years of age it is reasonable to go looking for a cause. There are several rare causes, including failure of development of the reproductive organs, chromosome abnormalities, and ovarian abnormalities.
The commonest reasons for amenorrhoea (primary and secondary) arc stress and low body weight which affect hormone levels. This results in what is called ‘anovulation’ (no egg being produced). Stress, either brief or long term, can affect the hormonal system so that the message to produce eggs, and therefore have a period, does not get through. It is not uncommon for women to have no periods while travelling, or changing jobs or schools, when unwell or in a state of emotional turmoil. Some of the hormones involved with ovulation are made in the brain, close to the areas involved with the production of other hormones, including the ‘stress’ hormones. It is not surprising then, that one can affect the other. Recovery is usually spontaneous, and den ling with the stress, if possible, can help.
Deficiencies of certain vitamins and minerals can have dramatic effects like anaemia (low red blood cell count), problems with the nervous system, and many other systems, resulting in the body not functioning as well as it should. Under a certain weight (different for every woman), a woman’s ovaries will not produce eggs. This shows up as not having periods, like the reaction to
stress, it is possible to see a kind of reason behind this. If the body could talk it may say: i make eggs every month in order to reproduce. If I would not be fit enough (because of stress or lack of nutrition) to have a successful pregnancy, I am not going to make an egg. That means I will not have a period’.
This makes sense in an evolutionary way.
Some girls and women do not just diet; some are suffering from a condition called ‘anorexia nervosa’, one of the class of conditions called ‘eating disorders’. This is a psychiatric condition, which involves compulsive dieting, often excessive exercising and, frequently, intentional vomiting (‘bulimia’). There may be many factors contributing to the development of this condition, which presents in the teenage years most commonly. There are varying degrees of severity of anorexia nervosa. With the correct diagnosis and treatment these conditions can be overcome. However, anorexia nervosa can be serious and, in severe cases, may be fatal. If a person is concerned that she may have an eating disorder, or is worried that a friend or family member may have a problem of this kind, it is a good idea to ask for advice from a doctor.
Young women who have prolonged (like a year or more) amenorrhoea may be at risk of developing the side-effects of lacking oestrogen. It has been shown that bone mass thins when there is not much oestrogen around, like after menopause. We build up our bone mass stores from our teens until our early thirties. Lacking oestrogen during this time may limit the ‘peak bone density’ we achieve. This means that there may be greater risk of osteoporosis and bone damage later in life. For this reason it is not uncommon for doctors to recommend that young women with prolonged amenorrhoea should have hormone supplementation, often in the form of the combined oral contraceptive pill.
There are other hormonal treatments which can be used to stimulate ovulation in women who have problems with amenorrhoea, bur these are usually only given if the woman is actively trying to get pregnant.
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