Some kinds of chronic, or on-going, pain have many causes. Back pain, for example, may be caused by a single factor, or any combination of these factors:
- Years of poor posture
- Improper lifting and carrying of heavy objects
- Being overweight, which puts excess strain on the back and knees
- A congenital condition such as curvature of the spine
- Traumatic injury
- Wearing high heels
- Sleeping on a poor mattress
- No obvious physical cause
- Ordinary aging of the spine (degenerative changes)