If you go to the hospital for checkup, you usually need to hang up the gastroenterology department or endocrinology department. Self-conscious thinness should first go to the Department of Gastroenterology for examination, because body thinness is usually caused by poor digestion and absorption, parasitic infections, lack of micronutrients and so on. You should have a fasting checkup, such as gastroscopy to check whether there are inflammation, ulcer and other diseases in the stomach, which may cause digestive dysfunction, malabsorption of nutrients, resulting in thinness. Certain endocrine diseases can also cause the body to lose weight, such as diabetes mellitus, hyperthyroidism, etc., so patients who are thin can hang up the endocrinology department. Endocrine diseases require targeted treatment. The patient is recommended to go to the hospital formal comprehensive examination, clear reasons, for the cause of the treatment. It is recommended to live a scientific and regular life, do not stay up late, do not eat cold food, eat more protein-rich, vitamin-rich food.