It might be a sharp stab. It might be a dull ache. Sooner or later, eight out of 10 of us will have back pain.
BACK PAIN OVERVIEW
Back pain in lower back or low back pain is a common concern, affecting most people at some point in their lifetime. Low back pain is not a specific disease. Rather, it is a symptom that may occur from a variety of different processes. In up to 85% of people with low back pain, despite a thorough medical examination, no specific cause of the pain can be identified.
- Low back pain is second only to the common cold as a cause of lost days at work. It is also one of the most common reasons to visit a doctor's office or a hospital's emergency department.
- For 90% of people, even those with nerve root irritation, their symptoms will improve within 2 months, no matter what treatment is used-even if no treatment is given.
- Doctors usually refer to back pain as acute if it has been present for less than a month and chronic if it lasts for a longer period of time.
Disc degeneration, injuries, diseases, infections, and even inherited conditions can cause back pain.
BACK PAIN CAUSES
Back pain is a symptom. Pain arising from other organs may be felt in the back. This is called referred pain. Many intra-abdominal disorders-such as appendicitis, aneurysms, kidney diseases, bladder infections, pelvic infections, and ovarian disorders, among others-can cause pain referred to the back. Your doctor will have this in mind when evaluating your pain.
- Nerve root syndromes are those that produce symptoms of nerve impingement (a nerve is touched), often due to a herniation (or bulging) of the disc between the lower back bones. Sciatica is an example of nerve root impingement. Impingement pain tends to be sharp, in one spot, and associated with numbness in the area of the leg that the affected nerve supplies.
- Herniated discs are produced as the spinal discs degenerate or grow thinner. The jellylike central portion of the disc bulges out of the central cavity and pushes against a nerve root. Intervertebral discs begin to degenerate by the third decade of life. Herniated discs are found in a third of adults older than 20. Only 3% of these, however, produce symptoms of nerve impingement.
- Spinal stenosis occurs as intervertebral discs lose moisture and volume with age, which decreases the disc spaces. Even minor trauma under these circumstances can cause inflammation and nerve root impingement, which can produce classic sciatica without disc rupture.
- Spinal degeneration is caused by alterations in the disc that progress to degeneration. This, coupled with disease in joints of the low back, causes spinal canal narrowing. These changes in the disc and the joints produce symptoms and can be seen on an x-ray. A person with spinal degeneration may have morning stiffness or pain while standing for a long time or walking even short distances.
- Cauda equina syndrome is a medical emergency. Disc material expands into the spinal canal, which compresses the nerves. A person would experience pain, possible loss of sensation, and bowel or bladder dysfunction. This could include inability to control urination causing incontinence, or the inability to begin urination.
- Musculoskeletal pain syndromes that produce low back pain include myofascial pain syndromes and fibromyalgia.
- Myofascial pain is characterized by pain and tenderness over localized areas (trigger points), loss of range of motion in the involved muscle groups, and pain radiating in a characteristic distribution but restricted to a peripheral nerve. Relief of pain is often reported when the involved muscle group is stretched.
- Fibromyalgia results in pain and tenderness on 11 of 18 trigger points when touched, one of which is the low back area, as classified by the American College of Rheumatology. Generalized stiffness, fatigue, and muscle ache are reported.
- Other skeletal causes of low back pain include osteomyelitis or sacroiliitis (infections of the bones of the spine). This pain is usually worse at night and is worse when sitting or standing for a long time.
- Tumors, possibly cancerous, can be a source of skeletal pain
BACK PAIN SYMPTOMS
Pain in the lumbosacral area (lower part of the back) is the primary symptom of low back pain.

- The pain may radiate down the front, side, or back of your leg, or it may be confined to the low back
- The pain may become worse with activity.
- Occasionally, the pain may be worse at night or with prolonged sitting such as on a long car trip.
- You may have numbness or weakness in the part of the leg that receives its nerve supply from a compressed nerve.
- An example of this would be an inability to plantar flex the foot. This means you would be unable to stand on your toes or bring your foot downward. This occurs when the first sacral nerve is compressed or injured.
- Another example would be the inability to raise your big toe upward. This results when the fifth lumbar nerve is compromised.
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