Poor expression ability varies among people of different age groups as well as their surroundings, and the specific reasons vary, mostly related to lack of knowledge, introversion, disease, etc. 1. Lack of knowledge: If the patient is a child, consider the possibility of lack of knowledge. Parents do not pay attention to the child’s language learning and low vocabulary, which can lead to poor expression. Parents can let their children talk more and listen patiently, say more children’s expression ability naturally improve. In addition, children can memorize more texts after school, which can improve language expression; 2, introversion: poor expression may be related to their own introverted personality, do not love to express themselves, after bold attempts, the encouragement and praise of those around them, will generally improve; 3, disease: if patients suddenly appear poor expression, suggesting that there is a problem with cognitive function, usually due to abnormal brain function, should promptly Seek medical examination to exclude organic brain diseases. If the patient is elderly, it may be Alzheimer’s disease, and it is recommended to go to the hospital for a full set of cognitive function screening. If cognitive impairment is detected, medications should be used as soon as possible to avoid worsening of symptoms. In addition, patients with social phobia become anxious and nervous in social situations and are not able to express themselves well or even speak.