The causes of elevated body temperature during nervousness and fear are as follows: 1. Phytodysfunction, when nervousness and fear occur, the heat-sensitive neurons in the hypothalamic thermoregulatory center will shift upwards, so there will be an increase in body temperature. 2. 3. Hyperendocrine diseases, such as hyperthyroidism and hyperadrenocorticism, can cause an increase in body temperature when the nervous, humoral, and endocrine regulatory systems are unstable, especially when the patient is nervous and afraid. 4.