Always nervous, afraid of the following possible causes: 1, environmental stimuli, such as stress, encounter stressful events or major events, such as work stress, poor family relations, or the death of a loved one, etc.. There are such things that can easily cause normal emotional reactions, such as nervousness, anxiety, or even depression, unhappiness, etc.. These emotional reactions are normal because it is a normal protective mechanism for oneself in order to cope with environmental problems. 2, there may be certain character defects, very easy to be nervous, very low self-esteem, introverted, not talkative, while some people are especially strong, especially perfectionist will easily become nervous and anxious, they do not do things well, it is easy to fall into pessimism and even anxiety. 3, there may be The problem of anxiety disorder, anxiety disorder as a common psychiatric problem, the main performance is the mental tension, quiet, always anxious, worried, the heart is always hanging. Also accompanied by physical symptoms, such as headache, dizziness, panic, palpitations, sweating, blushing, etc.. It may also be accompanied by behavioral symptoms, such as fidgeting back and forth, or standing or sitting, as well as hand tremors, or even tremors and other external manifestations. The above reasons are common causes and can be targeted for treatment, intervention and management.