Nonspecific musculoskeletal
Viral myalgias
Scheuermann’s kyphosis
Spondylolysis, spondylolisthesis
Sickle cell crisis
Scoliosis
Inflammatory spondyloarthropathies (ankylosing spondylitis, IBD, reactive arthritis)
Trauma, vertebral fracture
Syringomyelia
Back mouse
Herniated disk
slipped apophysis
Slipped vertebral epiphysis
Juvenile intervertebral disc calcification
Tumor
Leukemia or lymphoma
Discitis
Epidural abscess
Vertebral osteomyelitis
Sacroiliac joint infection
Psychiatric
Pyelonephritis
Kidney stone
Pneumonia
IBD = Inflammatory bowel disease
Further Reading
Phys Sportsmed. 2014 Feb; 42(1): 94–104. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4112374/
Am Fam Physician. 2007 Dec 1;76(11):1669-1676. https://www.aafp.org/afp/2007/1201/p1669.html