If you normally eat normally and still lose weight significantly, it may be due to hyperthyroidism, diabetes, intestinal parasites, gastroenteritis, etc. It is recommended to visit the hospital in time to determine the cause and treat the cause. Common causes and treatments are as follows: 1. Hyperthyroidism: The thyroid gland synthesizes and releases too much thyroid hormone, causing hyper-metabolism and sympathetic excitement in the body, resulting in eating and increased stools but weight loss. You can take propylthiouracil tablets for treatment. During the treatment period, do not eat things with high iodine content, such as nori, kelp and seafood. Keep your mood relaxed, don’t stay up late at night, and make sure you get enough sleep; 2. Diabetes: the typical symptoms of diabetes are polydipsia, polyuria, polyphagia and weight loss. If diagnosed with diabetes, you can choose to take oral metformin or gliclazide tablets and other glucose-lowering drugs for treatment under the guidance of a doctor, in addition to insulin injection; 3, intestinal parasites: parasites in the intestines can cause the body to lose weight, you can take oral albendazole to treat parasitic diseases. At the same time in daily life, do not eat raw food or uncooked food, do not drink raw water, pay attention to raw food and cooked food kitchen utensils should be separated, through these methods to prevent the occurrence of parasitic diseases; 4, gastroenteritis: some patients with chronic gastroenteritis due to poor digestion and absorption, malnutrition, the symptoms of wasting. Colloidal bismuth pectin, bismuth potassium citrate capsules, cimetidine, ranitidine and other drugs can be used for treatment.