Sweating profusely as soon as you eat may be physiologic, or it may be caused by hyperthyroidism, diabetes, tuberculosis, etc. 1. physiological phenomenon: in the process of eating if the food is too hot, the environment temperature is too high and so on, will lead to the expansion of human sweat glands, the phenomenon of sweating. This is a normal physiological phenomenon and can be relieved after meals. 2. Hyperthyroidism: Hyperthyroidism can lead to excessive secretion of thyroid hormones, the body’s metabolism accelerated, sweating, heat intolerance, hyperphagia and other symptoms, it is easy to eat a full head of sweat. 3. Diabetes: the disease is a chronic metabolic disease, can cause damage to the body’s autonomic nervous system, the phenomenon of easy sweating, resulting in a meal on the head sweating. 4. Tuberculosis: tuberculosis is a chronic infectious disease, patients usually have night sweats, low-grade fever, loss of appetite and other symptoms, in the phenomenon of eating a full head of sweat. If physiological problems are ruled out, patients should seek medical attention for examination to clarify which aspect of the body is in trouble and treat it in time.