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Back Pain and Evolution

By: Suzanne Elvidge BSc (hons), MSc - Updated: 11 Mar 2011 |
 
Back Pain And Evolution

Low back pain is a common complaint in modern society – but is it caused by modern lifestyles or is it part of the evolution from an ape-like ancestor to humans that stand and walk on two legs?

The Shape of the Spine

Humans have evolved from ancestors that are similar to modern apes. The spines of apes are relatively straight because, while some apes do walk on two legs occasionally, they tend to spend most of their time on all fours. The spines of modern humans have evolved to have a gentle S-shaped curve, because this helps support and spread the weight of the upper body, and maintain balance while on two legs. This curve becomes more exaggerated in women during pregnancy, in order to help maintain balance as the baby grows and the woman’s centre of gravity changes. This increased curvature usually after birth.

Sitting Upright

Sitting upright in a chair is not a natural position for an ape. However, it is also not a natural position for the evolved human spine, as it distorts the S-shape of the curve. The solution to this is to choose a chair that supports the curve of the back, and to avoid sitting for extended periods of time.

Standing and Walking

When humans started standing and walking, a spine that originally evolved to be parallel to the ground became upright, and had to cope with supporting the whole of the upper body weight when standing and walking. There have been some changes to the human spine through evolution to help with the upright posture, but it is also important to make sure that the core muscles, including the stomach and back muscles, are strong, to help support the spine. Maintaining a healthy weight also helps, as it reduces the load that the spine has to carry.

Back Pain and Organs

When humans’ ancestors were on all fours, the organs inside the body hung down from the spine. Once human beings started to walk to two legs, these internal organs could potentially become compressed by the weight of the organs above them, which can cause discomfort, and this can be felt in the back, which is known as ‘referred pain’.

Sedentary Lifestyles

Our ape-like ancestors were much more active, spending much more time finding food and defending territory. Many modern humans have sedentary jobs, for example spending a lot of time in front of computers. This can cause back pain, stiffness and discomfort, partly because the stomach and back muscles do not get enough exercise and therefore are no longer strong enough to support the upper body. The increasingly sedentary lifestyle can go with increasing body weight, which puts further stress on the back.

Causes and Symptoms

Whether back pain is a result of evolution or not, it is important to be aware of the symptoms of back pain, so that it can be treated before it becomes severe. It is also important to be aware of what can trigger back pain and what can prevent it – regular exercise, maintaining a healthy weight through healthy eating, and good posture when sitting and standing.

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