First of all it is important to understand that back pain is a symptom of a medical condition, not a diagnosis itself. At time, it develops without a specific cause which only your physician can identify with a diagnostic test. The conditions related to back pain or the causes include:

Muscle or Ligament Strain – Any sudden awkward movement or repeated lifting of heavy objects can strain back muscles and spinal ligaments. If you are not in a good physical condition, constant strain on the back can cause painful spasms on the muscle.

Ruptured or Bulging Discs – Discs cushion the vertebrae in the spine. At times, the soft matter present in the disc may rupture or bulge and gets pressed on a nerve. Though ruptured or bulged disk seen on an X-ray may not equal back pain, it may incidentally found in people who don’t have back pain.

Arthritis – Osteoarthritis affects even the lower back. Arthritis in the spine can lead to narrowing of the region around the spinal cord, a condition known as spinal stenosis.

Skeletal Irregularities – Curved spine can also lead to back pain. Scoliosis, a condition where in the spine curves to one side is one of the causes.

Osteoporosis – Brittle and porous vertebrae bones can cause compression fractures of spinal vertebrae, which may cause back pain.