When a child cries, their lips turn black, what should be done?

Patient's question:

I want to ask why the lips turn black when some children cry when they are sad. Previous treatment history and effectiveness: No illness is concerned about what kind of help: What is the reason

Doctor's answer:

When a child cries, their lips turn black, which could be caused by a congenital heart disease. It is recommended to go to the hospital for an echocardiogram to rule out congenital heart disease.
Advice: If a child with congenital heart disease experiences shortness of breath and cyanosis after exercise, parents should pay attention and promptly take them to the hospital for a thorough echocardiogram to rule out congenital heart disease.
The above is advice on the issue of "abnormal symptoms that appear when a child cries." I hope it helps you. Wishing you good health!