Temporary reactive psychosis, or acute transient psychotic disorder, is a group of psychotic disorders with a rapid onset, complete remission, and brief duration. It is characterized by sudden onset of psychotic symptoms and has a duration of less than 1 month. 1. Etiology: the etiology is not clear, there may be biological factors and socio-cultural factors. 2. Clinical manifestations: delusions, hallucinations, disorganized speech, and markedly disturbed or catatonic behavior may occur; episodes last at least 1 day, less than 1 month, and ultimately result in a full return to preexisting levels of functioning. 3. Treatment and prognosis: Antipsychotic medication is preferred, and benzodiazepines and mood stabilizers may be used in combination if significant agitation or affective symptoms are present. The course of the disease is short, and most cases resolve completely within 2 to 3 months, with a good prognosis. When the above clinical manifestations occur, one should go to a specialized hospital and follow the doctor’s instructions.