What happens when a child cries until he faints?

A child who cries to the point of fainting may have a breath-holding seizure, or it may be caused by a heart condition such as tetralogy of Fallot.
1. Breath-holding seizure: If the child’s character is more anxious, and the lung ventilation function is impaired when he cries, he may have a breath-holding seizure, which leads to transient cerebral ischemia and hypoxia, and fainting occurs.
2. Tetralogy of Fallot: If a child has a heart condition such as tetralogy of Fallot, he or she will experience a lack of blood and oxygen supply, such as purple lips, and even fainting when overly emotional, such as when he or she cries or exercises strenuously.
There may be other reasons for children to cry to fainting, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.