Crying and laughing disorder is a condition in which the patient himself cannot control his emotions, sometimes laughing and sometimes crying, and is unpredictable. This disease may be due to problems in the brain and can be treated in the neurology and psychiatry departments of hospitals. The cause of crying and laughing disorder is mainly a disorder of brain function, abnormal mental activity, and may also be due to the effect of certain stimulants. Reactive psychosis is a common cause of crying and laughing disorder. Reactive psychosis is directly caused by intense or continuous stressful mental stimuli. The main components of its clinical manifestations are closely related to trauma and are accompanied by corresponding emotional experiences that are easily understood. Once the causative factors are eliminated or the environment is changed, and with appropriate treatment, the mental state can return to normal. Therefore, the prognosis of reactive psychosis is good, and relapse is usually not repeated. Crying and laughing disorders caused by reactive psychosis are divided into two categories, acute and chronic, according to the form of onset. The acute form is dominated by blurred consciousness; the chronic form is dominated by emotional, thinking or perceptual disturbances. The main signs are: 1. Reactive manic state Often after the acute mental factors suddenly crying and laughing abnormally, babbling, tearing clothes and destroying things, and even hitting people. In severe cases, there may be blurred consciousness, nervous expression, fear, and hallucinations, delusions, etc. 2. Reactive depressive state: depressed mood, often in touch with the scene, sighing, anxiety, self-blame, negative pessimism about their future, and even suicidal behavior. There are often sleep disorders, mostly difficulty in falling asleep, easily awakened by nightmares, feeling tired and weak. 3. Reactive lignocaine: Dullness and immobility, no emotional reaction, often appearing immediately after acute trauma, generally lasting for a short period of time, can return to normal or turn into a blurred state of consciousness. 4. Reactive delusional disorder: The patient may have suspicions related to psychological factors, such as feeling that someone is talking, stalking, monitoring, persecuting, etc., sometimes accompanied by psychogenic hallucinations and delusions. Patients are in good contact with their environment and have the ability to recognize their suspicion symptoms.