In most cases, thoracic spondylosis occurs as a result of degenerative changes in the spine due to aging. Intervertebral discs become more dry and thin around the time a person turns 40.
Disc degeneration can cause disc bulging – one of the signs of thoracic spondylosis. Aging in the thoracic region of the spine can also cause signs of spondylosis, as bone spurs form on the vertebral body or facet joints. With age, ligaments that bind the spine together become thickened and stiff.
This condition can also cause symptoms of thoracic spondylosis. Usually, thoracic spondylosis occurs in older people. But some factors such as an injury to the thoracic region of the spine can contribute to this condition in young people.
Being overweight or inactive are also risk factors in the development of thoracic spondylosis. Holding the thoracic spine in an uncomfortable position for prolonged periods contributes to the development of spondylosis.