Attention deficit disorder is one of the most important manifestations of ADHD. It is characterized by inattentiveness, inability to pay attention in class, and easily distracted by environmental disturbances. Frequent changes in the object of attention. He or she may not be able to pay attention to homework, which is described by parents as doing and playing and being careless; he or she may be distracted by parents’ instructions and seem to listen to them. Does not finish what he/she starts, often stops halfway or ends up in a tiger’s head. The child procrastinates on homework, constantly interrupting with reasons such as drinking, eating, or urinating, and taking significantly longer to do homework. Some children may stare at one place, wander, daze, or look at the teacher, but they do not know what is going on in their minds. When the teacher asks a question, the child often does not know what the question is about. Hyperactivity is another common symptom of ADHD. The symptoms include increased activity, inappropriate running, climbing up and down, or small movements, inability to sit still in the classroom, often wriggling in and out of their seats, and in severe cases, leaving their seats and walking around or leaving the classroom without permission. Talk a lot, “people are crazy”, make noise, interrupt, cause trouble, affect classroom discipline, and aim to attract attention. Likes to play dangerous games and often loses things. Impulsiveness Unstable emotions, easily provoked, impulsive, capricious, poor self-control. Easily overexcited by external stimuli and easily frustrated. Childish, acts without considering the consequences, prone to dangerous or destructive behavior, and does not learn lessons afterwards. Low or fluctuating academic performance Children with ADHD have normal or basically normal intelligence, and low or fluctuating academic performance is related to inattention and hyperactivity. The timing of low academic performance depends on the level of intelligence and the severity of ADHD. Children with moderate to severe intellectual ability may have low academic performance early in the school year; those with high intellectual ability and mild ADHD symptoms may have low academic performance in higher grades. If parents find that your child has the above symptoms, they should not ignore them and take their child to a regular hospital in time.