Stiffness in the lower back when bending over may be caused by factors such as fasciitis, lumbar disc herniation and lumbar muscle strain. 1. Fasciitis: the disease may be related to cold, chronic strain and other factors, lumbar dorsal myofasciitis will appear as diffuse soreness in the low back, muscle tension and stiffness may occur when bending over, excessive activity or prolonged inactivity may induce. 2. Lumbar disc herniation: the disease is related to lumbar degenerative disease, injury and other factors, the patient will have the symptoms of lumbago, or in the forward bending may be limited activities, low back stiffness symptoms. 3. Lumbar muscle strain: the disease and chronic strain, congenital deformities and other factors related to the patient will appear in the lumbar chronic pain symptoms, the condition is serious in the bending of the activities will be limited, muscle spasm symptoms. Bending the waist stiffness, you can go to the hospital in time, under the guidance of the physician for related treatment.