1. Genetic factors Genetic factors may be related to the disease, and there is no clear evidence that heredity plays an important role in the occurrence of the disease. <br>2. Before the illness, the patient's personality tends to be naive, timid, shy, highly dependent and highly introverted. <br>3. Psychosocial factors often play a more important role in the onset of disease. It may be that a certain situation happens to appear on the background of anxiety, or that acute anxiety occurs in a certain situation and fears it and become a target of terror. The horror of special objects may be related to parents' education, environmental impact, and personal experience (such as being bitten by a dog and fearing a dog).
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