Weight loss in the elderly may be related to diabetes, hyperthyroidism and chronic inflammation. 1. Diabetes: If an older person has diabetes, it may cause weight loss because although the patient’s blood sugar is elevated, the body is unable to utilize it and instead consumes fat and protein. Diabetic nephropathy can lead to a decrease in reabsorption due to damage to the kidneys, and weight loss can continue. 2. Hyperthyroidism: When the elderly suffer from hyperthyroidism, due to the secretion of a large number of thyroid hormones, the body’s metabolic ability will increase, the consumption of energy will be much higher than the average person, even if they usually eat a lot of weight loss will occur. 3. Chronic inflammation: When chronic inflammation occurs in the elderly, it will cause greater damage to the body, and common chronic inflammatory diseases include chronic hepatitis, chronic nephritis, chronic gastritis, etc. These will affect the body’s ability to provide nutrients to the body. These will affect the body’s absorption of nutrients and energy consumption, resulting in weight loss in the elderly. In addition to the above, there are other conditions that may lead to weight loss in the elderly, such as tuberculosis, tumors, cancer, etc. It is recommended to go to the hospital for examination, and follow the doctor’s instructions for timely and targeted treatment, so as not to delay the course of the disease.