When a headache occurs while swimming, it is mainly caused by the patient’s neurovascular headache. When entering the pool, the body temperature is at a slightly lower level, and the blood vessels in the head and the whole body need to contract, when the blood vessels contract, the tension of the blood vessels will increase, and then the patient will have a headache, which is a normal physiological phenomenon, and it is recommended that the patient does not need to worry. There are many triggering factors that can cause neurovascular headache, such as excessive emotional tension in daily life and headache when the wind blows, and some patients may suffer from neurovascular headache if they eat spicy and irritating food and drink alcohol frequently.