There are several causes of lumbar soft tissue edema: 1. traumatic factors, local soft tissue edema and other manifestations may occur after trauma and stretching of lumbar soft tissues. 2. local infection, infection can lead to local soft tissue irritation and edema, swelling and other manifestations. 3. specific diseases of the lumbar spine bones, such as lumbar spine tuberculosis or lumbar spine tumors, can also lead to local soft tissue edema. 4. connective tissue diseases, such as rheumatoid arthritis, rheumatoid joints or special reactive arthritis, if the acute early stage of inflammation may cause local soft tissue edema. For example, rheumatoid arthritis, rheumatoid joint or special reactive arthritis, if in the acute early stage of inflammation there may be local blood flow disorders, resulting in local soft tissue edema.