Swimming back pain consider lumbar muscle sprain, lumbar muscle injury, lumbar intervertebral disc herniation and so on. 1. Lumbar muscle sprain: incorrect swimming posture, or a sudden turn of the body during swimming, can cause lumbar muscle sprain, local oozing, swelling, poor blood circulation, inflammatory factors gathered, resulting in pain. 2. Lumbar muscle strain: Swimming for too long, or the water temperature is too low, can cause lumbar muscle pulling, spasmodic contraction, injury, resulting in localized swelling, poor blood circulation, while lactic acid metabolites continue to accumulate, can not be discharged, and soreness occurs. 3. Lumbar intervertebral disc herniation: suffering from lumbar intervertebral disc herniation, swimming amplitude is too large, may cause intervertebral disc herniation aggravation, triggering lumbar pain. Swimming lumbar pain, it is recommended to actively seek medical advice and treatment under the guidance of a physician.