Sudden back pain and breathlessness may be caused by kidney stones, lumbar disc herniation, scoliosis, etc. 1. Kidney stones: Kidney stones move to the ureter, which may irritate or block the ureter, leading to ureteral spasm, which will cause severe pain in the lower back, and may also make it hard to breathe. 2. Lumbar disc herniation: Lumbar disc herniation may be aggravated by exertion in the lower back, which may result in herniated back pain and breathlessness. 3. Scoliosis: Deformation of the spine can cause pain in the lower back and also affect gas exchange, making it easy to become short of breath and gasping for air. Sudden back pain and shortness of breath may also have other causes, it is recommended to go to the hospital in time to identify the cause of the disease and then targeted treatment.