The main causes of pain on both sides of the back and waist are related to lumbar muscle strain, lumbar myofasciitis, renal diseases and lumbar spine diseases. 1. Lumbar muscle strain: usually if you often bear weight and exertion, resulting in muscle strain on both sides of the back and waist, easily triggered by the symptoms of pain, pain is easily aggravated in the process of exercise. 2. Lumbar fasciitis: people who are often engaged in physical labor or have a long time of poor posture are prone to the problem of lumbar fasciitis, which leads to the symptoms of pain on both sides of the back and waist. 3. Kidney disease: when kidney disease occurs, such as pyelonephrosis, nephritis, etc., it can produce the symptom of pain on both sides of the back and waist. 4. Lumbar spine diseases: Lumbar disc herniation, lumbar spinal stenosis, lumbar degenerative disease, etc., can lead to the symptoms of back and waist pain on both sides of the back. If the pain is more serious or persistent, you need to consult a doctor in time, check the cause of the disease, under the guidance of a professional physician targeted treatment to prevent the condition from worsening.