Women behind the waist on both sides of the soreness, may be due to a variety of reasons: 1, long time to maintain a posture or overwork, such as long time bending, squatting or long time work, may cause the phenomenon of the back of the waist on both sides of the soreness, this phenomenon can be localized simple massage, massage strength should not be too large, at the same time, a posture to keep more than 2 hours when you must do the activities. 2, Lumbar muscle strain and lumbar disc herniation, can also cause the phenomenon of female lumbar back sides, lumbar muscle strain and lumbar disc herniation is a very common cause, the lesion is degenerative lesions, with the increasing age of the chances of appearing more and more, you need to go to the hospital for examination, to do the symptomatic treatment. 3, female menstruation will also appear behind the back of both sides of the phenomenon of soreness, you can localized hot compresses to ease the pain.