The child is 4 years old, especially crying if caused by timidity can be guided, caused by autism need to be trained, if caused by disease need to be treated accordingly. 1. timid: 4-year-old children due to contact with the outside world is not yet a long time, to new things easy to fear, easy to stimulate and other phenomena, usually can practice more social, take the child more games, activities, more contact with people, generally can gradually improve the boldness. 2. Autism: the existence of autism children will have social difficulties and other phenomena, there will also be crying and other phenomena, accompanied by stereotypical behavior, etc., the need for timely intervention, the corresponding rehabilitation training. 3. Disease: When a child suffers from certain diseases, such as acute appendicitis, inguinal hernia, etc., it is easy for the child to cry due to physical discomfort. Parents are advised to consult a doctor when their children cry abnormally to avoid delays. If the phenomenon of a child 4 years old crying is serious, you should go to the hospital in time to be evaluated and handled by a specialist.