The causes of numbness after running include respiratory alkalosis, cervical spondylosis, cerebrovascular disease and so on. 1. Respiratory alkalosis: when running excludes a large amount of carbon dioxide, leading to respiratory alkalosis, the patient may have the symptom of numbness after running; it will return to normal after a period of rest. 2. Cervical spondylosis: prolonged exertion may induce cervical spondylosis, when the nerve root is compressed, it may manifest as numbness after running; combined with the cervical spine triple-digit film or cervical spine MRI to confirm the diagnosis. 3. Cerebrovascular disease: when cerebral hemorrhage or cerebral infarction occurs, due to the pressure on the brain tissue, the sensory center is damaged, which is manifested as numbness of the hands after running; diagnosis is confirmed by head CT or MRI examination. After the onset of this disease, it is recommended that the patient should immediately go to the internal medicine clinic of the hospital, improve the auxiliary examination, and clarify the cause of the disease after treatment.