Often feel not full and hungry quickly, commonly due to the following reasons: First, physiological hunger. If the patient is in the stage of youth, more energetic, more exercise, strong digestive and metabolic capacity, often appear not full hungry fast. Second, mental illness. If the patient used to often through the diet to relieve their own stress, or the previous excessive dieting to lose weight, long-term loneliness, etc.. In the long run once encountered stress will lead patients to eat more, resulting in psychogenic polyphagia. Third, certain pathological conditions are prone to this symptom, such as the common hyperthyroidism, diabetes, poor digestive function, etc.. These diseases can cause patients to consume energy rapidly or the energy brought by food is wasted, leading to the patient’s own subjective feeling of energy deficiency and the need to supplement with more food.