Mental retardation, or mental retardation (MR), also known as mental retardation, is a common developmental disorder in childhood. Mental retardation is mainly manifested in low social adaptability, learning ability and self-care ability, and its intellectual activities such as language, attention, memory, understanding, insight, abstraction, thinking and imagination are obviously behind those of children of the same age. The total prevalence of mental retardation is about 1%-2%. The diagnosis of mental retardation is based on psychological test and adaptability evaluation.

At present, the main hazards of mental retardation are as follows:

1, with limited language and mobility.

Mental retardation will limit the development of children's language, behavior and other abilities, far behind normal children of the same age. Moreover, mental retardation will lead to children's language expression ability later than their peers, and their behavior is far less than that of normal children of the same age.

2. Limited learning ability

Children's learning ability is limited, and they lag far behind their peers at school age. At the same time, it will also affect the learning ability of adults, and it is easy to be laughed at by children of the same age, which will lead to children's inferiority complex and escape psychology, which will have a great impact on their mental health.

3. Poor living ability

In view of the influence of mental retardation on children, the disease can lead to giggle and poor understanding. If the problem of mental retardation is serious, children may not be able to understand the meaning of other people's language expression. Moreover, the disease will affect children's ability to live, leading to children's inability to stand on their own feet as adults.

4. Other dangers

Mental retardation sometimes leads to diseases such as cerebral palsy and epilepsy, as well as complications such as autism, hearing and visual impairment. Mental retardation will affect children's language ability and may lead to communication difficulties. Over time, it will lead to mental problems in children.