There are many reasons why a 50-year-old person suddenly loses weight, and the common reasons are physiological factors such as insufficient food intake, irregular life leading to malnutrition or mental stress, and also consumptive diseases such as hyperthyroidism, gastritis, cancer, hepatitis and so on, which lead to the patient’s wasting. 1. Physiological factors: insufficient dietary intake, irregular life, lack of exercise, as well as work pressure, mental stress and over fatigue, etc. can cause sudden wasting of 50-year-old patients, generally by strengthening the diet, improve the lifestyle, relieve the pressure and so on can be improved. 2. Pathological factors: common pathological causes of sudden weight loss in 50-year-old patients include cancer, hepatitis, tuberculosis and other chronic wasting diseases, hyperthyroidism, diabetes and other metabolic diseases, as well as gastrointestinal diseases such as gastritis and gastric ulcer. All of these diseases can be secondary to the patient’s sudden wasting. Therefore, when a 50-year-old patient suddenly develops wasting, attention should be drawn to it and, if necessary, consult a hospital to clarify the cause of the disease and treat it under the guidance of a doctor.