science

Low back pain

Low back pain is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Low back pain rather than just read about it. In short: Low back pain or lumbago is a common disorder involving the muscles, nerves, and bones of the back, in between the lower edge of the ribs and the lower fold of the buttocks. Pain can vary from a dull constant ache to a sudden sharp feeling.

Key takeaways

Low back pain belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Low back pain to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Low back pain from memory before moving on to harder problems.

Reference excerpt

Low back pain or lumbago is a common disorder involving the muscles, nerves, and bones of the back, in between the lower edge of the ribs and the lower fold of the buttocks. Pain can vary from a dull constant ache to a sudden sharp feeling. Low back pain may be classified by duration as acute (pain lasting less than 6 weeks), sub-acute (6 to 12 weeks), or chronic (more than 12 weeks). The symptoms of low back pain usually improve within a few weeks from the time they start, with 40–90% of people recovered by six weeks. In most episodes of low back pain a specific underlying cause is not identified or even looked for: the pain is believed to be due to mechanical problems such as muscle or joint strain. If the pain does not go away with conservative treatment or if it is accompanied by "red flag" symptoms such as unexplained weight loss, fever, or significant problems with feeling or movement, further testing may be needed to look for a serious underlying problem. In most cases, imaging tools such as CT scans are not useful or recommended for low back pain that lasts less than 6 weeks (with no red flags) and carry their own risks. Some low back pain is caused by damaged intervertebral discs, and the straight leg raise test is useful to identify this cause. In those with chronic pain, the pain processing system may malfunction, causing large amounts of pain in response to non-serious events. Chronic non-specific low back pain is a highly prevalent musculoskeletal condition that not only affects the body, but also a person's social and economic status. Chronic non-specific low back pain is affected by psychosocial factors and unhealthy lifestyles and habits, in addition to musculoskeletal issues. Normal activity should be continued as much as the pain allows. Initial management with non-medication based treatments is recommended. Non–medication based treatments include superficial heat, massage, acupuncture, or spinal manipulation. If these are not sufficiently effective, NSAIDs are recommended. A number of other options are available for those who do not improve with usual treatment. Opioids do not significantly reduce acute or chronic back pain and are not recommended in chronic low back pain due to the lack of benefit and risks of harm. Opioids carry a risk of side effects such as high rate of addiction, accidental overdose and death. Surgery may be beneficial for those with disc-related chronic pain and disability or spinal stenosis. No clear benefit of surgery has been found for other cases of non-specific low back pain. Low back pain often affects mood, which may be improved by counseling or antidepressants. Alternative medicine therapies do not carry enough evidence to recommend them. The evidence for chiropractic care and spinal manipulation is mixed. Approximately 9–12% of people (632 million) have low back pain at any given point in time, and nearly 25% report having it at some point over any one-month period. About 40% of people have low back pain at some point in their lives, with estimates as high as 80% among people in the developed world. Low back pain is the greatest contributor to lost productivity, absenteeism, disability and early retirement worldwide. Difficulty with low back pain most often begins between 20 and 40 years of age. Women and older people have higher estimated rates of low back pain and also higher disability estimates. Low back pain is more common among people aged between 40 and 80 years, with the overall number of individuals affected expected to increase as the population ages. According to the World Health Organization in 2023, low back pain is the top medical condition world-wide from which the most number of people world-wide can benefit from improved rehabilitation.

Signs and symptoms In the common presentation of acute low back pain, pain develops after movements that involve lifting, twisting, or forward-bending. The symptoms may start soon after the movements or upon waking up the following morning. The description of the symptoms may range from tenderness at a particular point, to diffuse pain. It may or may not worsen with certain movements, such as raising a leg, or positions, such as sitting or standing. Pain radiating down the legs (known as sciatica) may be present. The first experience of acute low back pain is typically between the ages of 20 and 40. This is often a person's first reason to see a medical professional as an adult. Recurrent episodes occur in more than half of people with the repeated episodes being generally more painful than the first. Other problems may occur along with low back pain. Chronic low back pain is associated with sleep problems, including a greater amount of time needed to fall asleep, disturbances during sleep, a shorter duration of sleep, and less satisfaction with sleep. Chronic low back pain is also associated with depression and anxiety.

Causes

Low back pain is not a specific disease but rather a complaint that may be caused by a large number of underlying problems of varying levels of seriousness. The majority of low back pain does not have a clear cause, but is believed to be the result of non-serious muscle or skeletal issues such as sprains or strains or muscle spasms. About 90% of actue low back pain is nonspecific. Obesity, smoking, weight gain during pregnancy, stress, poor physical condition, and poor sleeping position may also contribute to low back pain. There is no consensus as to whether spinal posture or certain physical activities are causal factors. A full list of possible causes includes many less common conditions. Physical causes may include osteoarthritis, degeneration of the discs between the vertebrae or a spinal disc herniation, broken vertebra(e) (such as from osteoporosis) or, rarely, an infection or tumor of the spine. Women may have acute low back pain from medical conditions affecting the female reproductive system, including endometriosis, ovarian cysts, ovarian cancer, or uterine fibroids. Nearly half of all pregnant women report pain in the low back during pregnancy, which is attributed to changes in posture and the relocation of the center of gravity, leading to strain on the musculoskeletal system, including muscles, ligaments, and joints. Low back pain can be broadly classified into four main categories:

… excerpt ends here. Continue reading the full article.

Illustrations

Low back pain: A herniated disc as seen on MRI, one possible cause of low back pain — A herniated disc as seen on MRI, one possible cause of low back pain

Worked examples

Example 1 — a first encounter with Low back pain

Start with the simplest possible case. Write down what Low back pain claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Low back pain before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Low back pain ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Low back pain

In research: Low back pain appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Low back pain in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Low back pain is common in secondary-school and first-year university syllabi. It links to neighbouring topics Human back, Pain, Symptoms and signs: musculoskeletal system, so understanding it makes those chapters shorter.
In everyday life: Look for Low back pain outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Low back pain” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Low back pain in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Low back pain means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Low back pain out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Low back pain in simple terms?

Why does Low back pain matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Low back pain?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Low back pain.