backpainDoes your back get sore when sitting all day? There’s a reason for it.
The compressive force when sitting is caused by an increased amount of pressure on your intervertebral discs and facet joints. If this has been with you for some time then you should consult a chiropractor. The joints, as they tighten, can cause back pain as they inflame and sensitise the adjacent nerves. This can also be contributed to by a bulging disc which can be damaged with repetitive micro-trauma or with a sudden increased pressure.
Pressure on the discs can cause a disc herniation which can cause pain down the leg known as sciatica. Decompressive techniques and rehabilitation from your chiropractor can be very effective for the latter conditions (sciatica).

A recent study of 102 patients who had suffered a lumbar disc herniation compared the use of epidural steroid injections versus chiropractic. The results showed that 76% of chiropractic patients reported feeling better or much better compared with 62.5% of epidural steroid injection patients. It was also shown that a higher percentage of chiropractic patients had significant reductions in their pain.  The overall cost was lower  too.
If you are in the early stages of back soreness, gentle low back stretching and mobility may be very effective. If you have tried this already and the soreness still prevails, it may beneficial to consult a chiropractor.

Reference: Peterson, CK, et al. Symptomatic Magnetic Resonance Imaging-confirmed lumbar disk herniation patients: a comparative effectiveness prospective observational study of 2 age- and sex-matched cohorts treated with either high-velocity, low-amplitude spinal manipulative therapy or imaging-guided lumbar nerve root injections. Journal of Manipulative and Physiological Therapeutics 2013; doi: 10.1016/j.jmpt.2013.04.005.