Occasional feeling of fear in the mind, with symptoms of fainting, stretching of arms and legs, and trembling, are mostly seen in stress, anxiety, hypoglycemic syndrome, epilepsy, and other conditions. 1. Stress: This is mostly a physiological condition, which can be caused by a major irritating or traumatic event, and will be relieved after rest. 2. Anxiety disorders: Anxiety disorders can be characterized by mental symptoms such as fear, as well as autonomic dysfunction, leading to trembling of the hands and feet, dizziness, fainting and other conditions. 3. Hypoglycemia syndrome: If the blood sugar is too low, there will be panic, dizziness, shaking hands and feet, and in severe cases, fainting. 4. Epilepsy: epileptic patients may have symptoms of inner fear, sudden collapse, tremor and convulsions, and after the seizure, they often can’t recall and have no autonomous consciousness. This situation should be timely to the hospital, to clarify the cause of the disease, timely treatment.