A sudden burst of heat and sweat may be due to perimenopausal syndrome, hyperthyroidism, hypoglycemia, anxiety, autonomic dysfunction and other causes. 1. Perimenopausal syndrome: female patients age to about 50 years of age, ovarian function gradually physiological decline, the amount of estrogen secretion is reduced, resulting in skin capillary vasodilatation disorders, so there will be this symptom. 2. Hyperthyroidism: the thyroid gland is hyperfunctional and synthesizes a large amount of thyroid hormone, when the stored thyroid hormone is released transiently, the energy consumption of tissue cells increases, and the heat production and dissipation increases, so this symptom occurs. 3. Hypoglycemia: the low blood glucose caused by too little food, too many hypoglycemic drugs or insulin application and other factors, the cells of the body lack of energy supply and this symptom occurs. 4. Anxiety disorders: this disease will not only cause mental disorders such as anxiety and fear, but also lead to physical symptoms such as panic, sweating, fatigue and burning sensation of skin. 5. Autonomic dysfunction: Sympathetic and parasympathetic dysfunction, resulting in skin capillary dilatation, sweating and heat dissipation increase, so the symptoms. A sudden burst of hot sweating may be related to a variety of factors, it is recommended to consult a doctor for a clear diagnosis.