Understanding low back pain

Low back pain is one of the most familiar complaints there is. It can arrive in an instant, halfway through lifting a bag of shopping, or creep up over a week of long drives and late nights. This page explains how the pain is usually described, what tends to sit behind it, and how people get through ordinary days while it settles.

What "low back pain" covers

The phrase is a description of where it hurts rather than a diagnosis. The lower back, or lumbar region, is the part of the spine between the bottom of the rib cage and the pelvis. It carries much of the weight of the upper body and bends, twists and straightens many times a day, so it is exposed to a great deal of everyday wear. MedlinePlus explains in its article on acute low back pain that the pain may come with stiffness, reduced movement of the lower back and difficulty standing up straight.

People describe the feeling in many ways: a dull ache across the belt line, a sharp catch when turning, a band of tightness after sitting, or pain that seems to travel into the buttock or leg. Those differences matter, and a health care provider will usually ask about them.

Short-lived and longer-lasting pain

Doctors often sort back pain by how long it has been going on. Pain that comes on suddenly and passes fairly soon is called acute. Pain that lingers for a longer stretch is sometimes called subacute, and pain that carries on for a long time is called chronic. The National Institute of Neurological Disorders and Stroke uses a similar framework for pain in general: acute pain tends to start suddenly and act as a warning signal, episodic pain comes and goes, and chronic pain continues well past the expected healing time. The labels are useful mainly because they shape the questions a provider asks and the kind of care they consider.

Common everyday causes

Very often no single dramatic event explains a sore back. The American Academy of Orthopaedic Surgeons, in its OrthoInfo page on low back pain, points to muscle soreness from activity as one of the more common causes, with muscle and ligament fibres overstretched or injured by something the body is not used to. The examples it gives are familiar: the first round of a sport in a new season, or far too much yard work or snow shovelling in one day.

Other threads appear again and again in public health guidance:

• Sudden loads. Lifting something heavy or awkward, especially with a twist, can strain the muscles and ligaments that steady the spine. The lifting and carrying page covers this in more detail.
• Long spells in one position. Sitting for hours, driving long distances or standing at a counter without a break all keep the same tissues under steady load.
• Changes in the discs and joints. The discs between the vertebrae and the small joints at the back of the spine change with age, and those changes are part of the picture for many people. The discs and sciatica page explains them.
• Fitness and strength. Weaker trunk muscles, or a sudden burst of hard exercise after a long spell of inactivity, are both linked with back pain in public health guidance.

Less often, back pain is a sign of something that is not a muscle or joint problem at all, which is why the warning signs below matter.

Ordinary days while it settles

Many episodes of low back pain are the kind that people manage day to day while they ease. Public guidance tends to discourage long stretches in bed; MedlinePlus notes that staying in bed for too long can make back pain worse. People commonly keep up gentle everyday movement, such as short walks around the house or the block, change position often rather than holding one posture, and ease back into their usual activities as they feel able.

Some people use heat or cold packs, and some use over-the-counter pain medicine; a pharmacist or health care provider can advise on what is suitable for you, especially if you take other medicines or have other health conditions. If the pain is severe, does not settle, or keeps coming back, it is worth seeing a provider who can examine you, ask about your history and talk through the options, which may include physical therapy, exercise programmes and other kinds of care.

Keeping a note

If you do see someone, it can help to jot down a few details beforehand: when the pain started and what you were doing, where exactly it hurts and whether it spreads, what makes it better or worse, how it affects sleep and work, and anything you have already tried. The before a first visit page has a fuller list of questions.