Inexplicable fear and dread may be caused by the following reasons: First, the problem of anxiety disorders. Patients with anxiety disorders are always anxious, fearful, worried, and worried every day, and they may be accompanied by somatic symptoms, such as headache, dizziness, nausea, vomiting, panic, palpitations, etc. They may also have behavioral symptoms, such as walking around, fidgeting, etc. Patients with anxiety disorders are prone to anxiety and fear without any reason, and the anxiety and fear do not have a clear object or clear content. Second, it may be caused by character defects, some people are introverted, sensitive, suspicious, more timid and fearful since childhood, this time it is easy to cause fear, anxiety problems, especially in interpersonal relationships, social occasions, daily life and work, there may be fear, fear and other emotions. Third, it may also be caused by physical reasons, such as endocrine disorders, especially hypothyroidism, etc. These physical diseases may cause sensitivity, anxiety, inexplicable fear and other emotions.