Make note on the following passage by using reduction devices.
Backache
Pain in the back is among the commonest of symptoms. The possible causes are very numerous. Most of them are not dangerous, but since backache occasionally indicates serious trouble the cause needs to be ascertained. As a rule, when backache is a symptom of disease elsewhere there are other indicates to be found; but some cases can be very puzzling.
The likeliest source of a backache is the back itself, and the likeliest cause is mechanical strain. Sometimes the effect of strain can be exactly defined e.g., a slipped disc or a crack in the vertebra. More often the precise effect of strain, the exact cause of pain, is obscure; one can say that through faulty posture a ligament has probably been stretched or that the smaller joints of the back are carrying an unfair load, but the details are open to discussion. What matters is that training in correct posture relieves the symptoms. Much the commonest fault is illustrated by someone tucking in the sheets on the far sides of a bed. The muscles and ligaments of the human back support it best in the upright position; they are not designed for a quadruped. When the body is suspended cantilever-fashion, at right angles to the things, there's is a severe shearing strain on the joints of the back.
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