The back pain is of two types. One is lower back pain, which occurs in the bony lumbar spine, discs between the vertebrae, ligaments around the spine, spinal cord, lower back muscles, abdominal and pelvic internal organs. The upper back pain is due to disorders of the aorta, tumors in chest and spine inflammation. The problem in muscles, ligaments, tendons, disks, and bones cause back pain. The reason can be anything from strain, structural problem (ruptured disk, sciatica, arthritis, osteoporosis), movement and posture, cancer of the spine, infection of the spine and shingles, etc. Constant pain, weight loss, numbness around the genitals, anus or buttock and pain that reaches the leg or knee are symptoms when you should visit the doctor without any delay.