High glucose is not necessarily diabetes mellitus, but diabetes mellitus is generally characterized by high blood glucose. High glucose is divided into physiologic and pathologic, and diabetes is a metabolic disease. 1. High glucose: high glucose generally refers to high blood sugar, there are physiological factors and pathological factors. Physiological factors include improper diet, obesity and so on, and patients usually do not have any symptoms. Pathological factors are commonly diabetes, Cushing’s syndrome, hyperthyroidism and so on. 2. Diabetes mellitus: Diabetes mellitus is a group of metabolic diseases characterized by increased blood glucose levels, the cause of which has not been clearly defined, and the common ones are genetic, environmental and so on. Patients may experience symptoms such as excessive drinking, excessive eating, excessive urination and weight loss. High glucose is not necessarily caused by diabetes, but people with diabetes generally have high blood glucose levels in their bodies. To determine whether you have diabetes, you should seek medical attention for a standardized test.