Backpain

The human back is composed of a complex structure of muscles, ligaments, tendons, disks and bones - the segments of our spine are cushioned with cartilage-like pads called disks. Problems with any of these components can lead to back pain. In some cases of back pain, its cause is never found. A man with visible spine holds his back. Problems with the spine such as osteoporosis can lead to back pain.

Strain - the most common causes of back pain are:
Strained muscles
Strained ligaments
A muscle spasm

Things that can lead to strains or spasms include:
Lifting something improperly
Lifting something that is too heavy
The result of an abrupt and awkward movement