The hunger fast alert hyperthyroidism, diabetes and fatty liver and other diseases. 1. Hyperthyroidism: Hyperthyroidism patients will be due to an abnormal increase in the secretion of thyroid hormones, resulting in an increase in basal metabolic rate, the patient’s energy consumption is huge, so eating will soon be hungry, patients with hyperthyroidism is usually accompanied by mood changes, such as anxiety and irritability. 2. Diabetes mellitus: Diabetes mellitus patients have the symptoms of three more and one less, including more drinking, more eating, more urination and weight loss, so they will also appear hungry quickly. 3. Fatty liver: Fatty liver patients have impaired ability to break down sugar in food to provide energy, and need to consume glycogen stored in the body, so they are also prone to hunger. Fast hunger may also be caused by other reasons, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor for targeted treatment.