Low back pain syndromes.
D006801:Humans; D010146:Pain / Q000209:etiology*; D010437:Peptic Ulcer / Q000150:complications; D013122:Spinal Diseases / Q000150:complications; D013125:Spinal Neoplasms / Q000150:complications / Q000556:secondary; D013166:Spondylitis / Q000150:complications