Minnie is 14 years old and is almost as big as her mother. Usually like swimming, playing basketball, very healthy body. But last July, when Minnie participated in the military training line exercise, she fainted twice for no reason. But after resting for a while and drinking some water, he was fine. The school doctor thought that the child was growing and developing, and the military training was physically demanding, so it might be caused by low blood sugar, but also reminded Xiaomin’s mother to take her to the hospital for a checkup to see if there were any problems with her heart or nervous system. Minnie had an EKG, heart ultrasound, and cranial CT, and found nothing wrong, so she had a sleep EEG, which also showed no special findings. 24-hour ambulatory EKG had sinus arrhythmia and wandering rhythm in the sinus node. The doctor advised Minnie according to the test results; if there is syncope again, she should come to the hospital in time to check blood sugar, ECG, etc., and if necessary, she can do upright tilt test to identify the cause of syncope. In recent days the weather is very hot and muggy, Minnie and her mother shopping mall, not long felt some dizziness, nausea, eyes blurred, suddenly fainted …… mother rushed to her pinch, 1-2 minutes later Minnie woke up. But the mother was in an anxious mood, not knowing what kind of disease Minnie had? When is she going to have another attack? What if something goes wrong? The neighbor, Auntie Wang, a pediatrician, told Minnie’s mother that Minnie probably had vasovagal syncope, which is a syncope caused by abnormalities in the regulation of the heart and vascular nerves, and suggested that she go to the hospital for some related tests. The pediatrician analyzed Xiaomin’s condition and previous test results and gave Xiaomin an upright tilt test. Minnie leaned on an inclined bed at about 70 degrees from the ground, and the physician and nurse carefully observed her breathing, heartbeat, blood pressure, etc. After more than 30 minutes passed, Minnie experienced dizziness, nausea, blurred eyes, and a drop in blood pressure …… The physician immediately put the inclined bed back into a flat position, and within 1 – 2 minutes Minnie’s symptoms disappeared. 2 minutes Minnie’s symptoms disappeared. After the examination, the doctor told Minnie’s mother that Minnie’s syncope was vasovagal syncope. About 80% of the causes of syncope in children belong to this category, and it is often triggered by mental tension, hot environment, long standing, sunlight, etc. Sometimes it is misdiagnosed as cardiovascular disease, but the prognosis is relatively good, so parents need not worry too much. Usually, children can do rehabilitation training, such as standing against the wall to improve autonomic function, and pay attention to drinking water in hot weather to prevent seizures. If the syncope recurs, you can choose medication under the guidance of a doctor. Although Xiao Min’s mother does not know much about vasovagal syncope, the cause of her child’s syncope was found out clearly, and the doctor told them how to prevent it in the future, so they feel much more secure.