Back pain may arise from the skin, muscles, nerves, vertebral bones or other organs which are in close proximity to the back. As a result, backache may not always be due to a problem in the back itself. Some possible causes of backache include:

• Poor posture.
• Trauma.
• Muscle strain.
• Muscle spasm.
• Pressure on a nerve root.
• Tears to the ligaments supporting the back.
• Fractures.
• Poor alignment of the vertebrae.
• Arthritis.
• Osteoporosis.
• Viral infections.
• Bacterial infections.
• Skin infections.
• Bladder or kidney infection.
• Gynecological problems in women (Endometriosis, Ovarian cysts).
• Ruptured or herniated vertebral disc.
• Spinal stenosis (narrowing of the spinal canal).
• Spine curvatures (Scoliosis or Kyphosis).
• Tumors of bones.