Stiffness of lumbar muscles half a month after minimally invasive lumbar spine surgery is generally not normal. Although there are some uncomfortable symptoms after lumbar spine minimally invasive surgery, such as pain, the stiffness of lumbar muscles is not normal, it may be the case that the surgery damages the lumbar muscles, ligaments, nerves, etc., which can be improved through exercise training, manipulation and massage, and physical factor therapy. 1. Exercise training: mainly through the training of the muscles of the lower back, exercise and stretch the stiff muscles to improve the stiffness of the lumbar muscles. 2. Manipulation: Through professional doctor’s manipulation treatment, the stiff muscles will be pushed and relaxed to relieve the muscle tension and stiffness, so as to achieve the therapeutic purpose. 3. Physical Factor Therapy: Improve the blood circulation in the lumbar region and enhance the motor function of the lumbar muscles by means of hot compresses and intermediate frequency electrical stimulation, so as to alleviate or reduce the stiffness of the lumbar muscles. If there is any stiffness in the waist muscles, you should go to the hospital in time to avoid delaying your condition.