Young people’s high blood sugar can be recovered if it is stress hyperglycemia, and it is generally unrecoverable if it is diabetes. 1. Stress hyperglycemia: Inflammatory infections, surgery, trauma and other stressful conditions, there can be a short period of high blood sugar, after the treatment of the original disease, blood sugar can be returned to normal. 2. Diabetes mellitus: Diabetes mellitus is a chronic disease, which is caused by low function of pancreatic β-cells or insulin resistance. Generally there is no recovery from diabetes because there is no clinical cure for diabetes. However, diabetic patients can control their blood sugar to the ideal level by controlling diet, moderate exercise and regular medication. Young people with high blood sugar should go to the hospital in time to improve the examination to find the cause of the disease and be treated under the guidance of the doctor.