Patients experience back pain after swimming. The cause of this pain may be due to the patient’s excessive activity or the low temperature of the water in the swimming pool, resulting in damage to the lumbar muscles, poor local qi and blood flow, stagnant qi and blood stasis, local meridian obstruction, and the accumulation of lactic acid in the muscles. During treatment, the patient can be instructed to stop exercising and rest in bed, and also pay attention to the warmth of the lower back. Local hot compress treatment, Chinese herbal fumigation, or infrared therapy, low and medium frequency electrotherapy, microwave therapy, etc. can effectively accelerate local blood circulation and promote the metabolism of lactic acid, which can play a role in relieving pain. Therefore, patients with this condition should consult a doctor in time, and after giving the correct treatment, they will be able to cure the disease as soon as possible.