Lateral lumbar pain may be caused by trauma, lumbar muscle strain, herpes zoster and other reasons, and should be promptly consulted to find out the cause. 1. Trauma: If the patient’s waist is hit by a blunt object or scratched by a sharp object, it can cause lumbar side pain, or redness, swelling, bleeding and other symptoms. 2. Lumbar muscle strain: it is mostly seen in those who have been engaged in heavy physical labor for a long time, or those who have been sedentary for a long time. As the waist is stretched and rubbed by the movement for a long time, or keep a posture for a long time, resulting in long-term stress on the lumbar muscles and lumbar vertebrae, it will cause lumbar side pain, this kind of lumbar pain is mostly manifested as soreness or intermittent pain. 3. Herpes zoster: It is caused by varicella-zoster virus infection. It can be distributed along the lumbar side, and on top of the erythema, clusters of blisters are formed, which are painful when touched. There may be other causes of pain along the side of the waist, and you should consult a doctor to clarify the specific cause and treat accordingly if necessary.