The dropping of things without signs and reasons may be a normal phenomenon caused by physiological reasons, or it may be caused by mania, schizophrenia and other mental illnesses, and it is not possible to judge the disease only based on a certain symptom, and it is recommended to consult a doctor for diagnosis in a timely manner. 1. Physiological reasons: Suddenly think of angry things or life pressure is too big, etc. often lead to sudden loss of control of emotions and the phenomenon of dropping things, but generally the emotions will return to normal after venting. 2. Mania: Mania often manifests itself as short temper, easy to anger, often act impulsively when stimulated, the phenomenon of dropping things for no reason, and easy to recur. 3. Schizophrenia: patients with schizophrenia often have a lot of hallucinations and delusions, and may be characterized by rage, impatience, and in severe cases, aggressiveness, and the phenomenon of suddenly dropping things. When patients drop things for no reason, do not judge the disease based on the symptoms, and do not self-medicate, it is recommended to consult a doctor in a timely manner, by the doctor’s interview, in order to exclude the physiological causes of targeted treatment.