Back pain (also known "dorsalgia") is pain
felt in the back that usually originates from the muscles, nerves, bones,
joints or other structures in the spine.
The pain can often be divided into neck pain, upper back
pain, lower back pain or tailbone pain. It may have a sudden onset or can be a
chronic pain; it can be constant or intermittent, stay in one place or radiate
to other areas. It may be a dull ache, or a sharp or piercing or burning
sensation. The pain may be radiate into the arm and hand), in the upper back,
or in the low back, (and might radiate into the leg or foot), and may include
symptoms other than pain, such as weakness, numbness or tingling.
Back pain is
one of humanity's most frequent complaints. In the U.S, acute low back pain
(also called lumbago) is the fifth most common reason for physician visits.
About nine out of ten adults experience back pain at some point in their life,
and five out of ten working adults have back pain every year.
The spine is a
complex interconnecting network of nerves, joints, muscles, tendons and
ligaments, and all are capable of producing pain. Large nerves that originate
in the spine and go to the legs and arms can make pain radiate to the
extremities.
Back Pain Classification
Back pain can be divided anatomically: neck pain, upper
back pain, lower back pain or tailbone pain.
By its duration: acute (less than
4 weeks), subacute (4 – 12 weeks), chronic (greater than 12 weeks).
By its
cause: MSK, infectious, cancer, etc.
Associated
Conditions With Back Pain
Back pain can be a sign of a serious medical problem,
although this is not most frequently the underlying cause:
Typical warning
signs of a potentially life-threatening problem are bowel and/or bladder
incontinence or progressive weakness in the legs.
Severe back pain (such as
pain that is bad enough to interrupt sleep) that occurs with other signs of
severe illness (e.g. fever, unexplained weight loss) may also indicate a
serious underlying medical condition.
Back pain that occurs after a trauma,
such as a car accident or fall may indicate a bone fracture or other
injury.
Back pain in individuals with medical conditions that put them at high
risk for a spinal fracture, such as osteoporosis or multiple myeloma, also warrants
prompt medical attention.
Back pain in individuals with a history of cancer
(especially cancers known to spread to the spine like breast, lung and prostate
cancer) should be evaluated to rule out metastatic disease of the spine.
Back
pain does not usually require immediate medical intervention. The vast majority
of episodes of back pain are self-limiting and non-progressive. Most back pain
syndromes are due to inflammation, especially in the acute phase, which
typically lasts for two weeks to three months.
A few observational studies
suggest that two conditions to which back pain is often attributed, lumbar disc
herniation and degenerative disc disease may not be more prevalent among those
in pain than among the general population, and that the mechanisms by which
these conditions might cause pain are not known. Other studies suggest that for
as many as 85% of cases, no physiological cause can be shown.
A few studies
suggest that psychosocial factors such as on-the-job stress and dysfunctional
family relationships may correlate more closely with back pain than structural
abnormalities revealed in x-rays and other medical imaging scans.
Underlying Causes
& Sources of Back Pain
There are several potential sources and causes of back
pain. However, the diagnosis of specific tissues of the spine as the cause of
pain presents problems. This is because symptoms arising from different spinal
tissues can feel very similar and is difficult to differentiate without the use
of invasive diagnostic intervention procedures, such as local anesthetic
blocks.
One potential source of back pain is skeletal muscle of the back.
Potential causes of pain in muscle tissue include Muscle strains (pulled
muscles), muscle spasm, and muscle imbalances. However, imaging studies do not
support the notion of muscle tissue damage in many back pain cases, and the
neurophysiology of muscle spasm and muscle imbalances are not well
understood.
Another potential source of low back pain is the synovial joints of
the spine (e.g. zygapophysial joints). These have been identified as the
primary source of the pain in approximately one third of people with chronic
low back pain, and in most people with neck pain following whiplash. However,
the cause of zygapophysial joint pain is not fully understood. Capsule tissue
damage has been proposed in people with neck pain following whiplash. In people
with spinal pain stemming from zygapophysial joints, one theory is that
intra-articular tissue such as invaginations of their synovial membranes and
fibro-adipose meniscoids (that usually act as a cushion to help the bones move
over each other smoothly) may become displaced, pinched or trapped, and
consequently give rise to nociception.
There are several common other potential
sources and causes of back pain: these include spinal disc herniation and
degenerative disc disease or isthmic spondylolisthesis, osteoarthritis
(degenerative joint disease) and spinal stenosis, trauma, cancer, infection,
fractures, and inflammatory disease.
Radicular pain (sciatica) is distinguished
from 'non-specific' back pain, and may be diagnosed without invasive diagnostic
tests.
New attention has been focused on non-discogenic back pain, where
patients have normal or near-normal MRI and CT scans. One of the newer
investigations looks into the role of the dorsal ramus in patients that have no
radiographic abnormalities. See Posterior Rami Syndrome.
Back Pain Treatment
The management goals when treating back pain are to
achieve maximal reduction in pain intensity as rapidly as possible; to restore
the individual's ability to function in everyday activities; to help the
patient cope with residual pain; to assess for side-effects of therapy; and to
facilitate the patient's passage through the legal and socioeconomic
impediments to recovery. For many, the goal is to keep the pain to a manageable
level to progress with rehabilitation, which then can lead to long term pain
relief. Also, for some people the goal is to use non-surgical therapies to
manage the pain and avoid major surgery, while for others surgery may be the
quickest way to feel better.
Not all treatments work for all conditions or for
all individuals with the same condition, and many find that they need to try
several treatment options to determine what works best for them. The present
stage of the condition (acute or chronic) is also a determining factor in the
choice of treatment. Only a minority of back pain patients (most estimates are
1% - 10%) require surgery.
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