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Back pain. Computer-generated abstract artwork showing the torso of a woman lying down in side view, depicting lower back pain (lumbago). A bolt of lightning is striking the affected area. Pain in the lower back is very common. It is usually caused by strain to soft tissues (muscles, tendons or ligaments) around bones of the spine. People likely to suffer back pain are those whose work involves heavy lifting, or those who spend long periods sitting in one position. Pregnant women commonly suffer from back pain towards late pregnancy. Treatment includes rest and the use of painkilling drugs. (KEYSTONE/SCIENCE PHOTO LIBRARY/MEHAU KULYK)