Feeling hungry all the time may be related to under-eating, diabetes, hyperthyroidism and so on. 1. Eating too little: some people have a large amount of food themselves, and if they diet or do not eat enough, they will always feel hungry. 2. Diabetes mellitus: It is common to have poor pancreatic islet function. In this case, the glucose in the blood cannot be utilized by the body and is excreted directly in the urine. When the cells lack energy, they consume their own protein and fat to supply energy, thus making the patient feel hungry. 3. Hyperthyroidism: These patients are prone to frequent hunger pangs due to hypermetabolism, which promotes food absorption and consumption. Feeling hungry all the time can also be seen in other reasons, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for relevant examinations, with the help of the doctor to clarify the causes, and targeted treatment or therapy.