A quick recovery from fainting after strenuous exercise may be due to transient cerebral ischemia, epilepsy and other causes. 1. Transient cerebral ischemia: on the basis of the original narrowing of cerebral arteries, due to the fluctuation of blood pressure during strenuous exercise, the blood vessels originally supplying the brain undergo transient ischemia, which leads to fainting after exercise, and after the end of the exercise, the fluctuation of blood pressure is small, which can be recovered quickly again. 2. Epilepsy: the patient’s intense exercise may lead to abnormal discharges of neurons in the cerebral cortex, resulting in the performance of fainting and recovering quickly after exercise, which may be accompanied by motor abnormalities such as limb twitching, clonus and other manifestations. Fainting after strenuous exercise soon recovered may also be due to cerebral thrombosis, cardiogenic syncope such as arrhythmia and other reasons, if the patient appeared after strenuous exercise fainting soon recovered, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor, improve the relevant examination, to clarify the cause of the disease, symptomatic treatment.