The causes of lumbar swelling are the following: first, lumbar disc herniation: after the herniated disc compresses the surrounding nerve roots and causes lumbar swelling and soreness, usually accompanied by hip soreness and discomfort. Second, the fasciitis of the lumbar back muscles: fascias in the long-term chronic injury or cold after the occurrence of symptoms. The common symptom is the soreness and swelling of the lower back. Third, lumbar muscle strain: chronic injury to the lumbar muscle, chronic strain injury and cause lumbar soreness and swelling discomfort.