High blood sugar may be associated with infectious diseases, diabetes, etc. 1. Infectious diseases: For example, infections with bacteria, fungi, viruses, and other microorganisms may cause influenza, mumps, and so on. These disease episodes may present with high blood sugar. It is recommended to do the pathogenic bacteria test as soon as possible to clarify the type of pathogenic bacteria, and then use the symptomatic medication. 2. Diabetes mellitus: It is a metabolic disease caused by increased blood glucose levels in the body. Tests usually reveal high blood glucose, in addition to the typical symptoms such as dry mouth, excessive drinking, excessive urination, excessive eating, and weight loss that may occur. If diabetes is detected, it is necessary to seek medical attention as soon as possible, and if necessary, follow the doctor’s instructions to use hypoglycemic drugs to control the condition, such as metformin and insulin. If you are found to have high blood glucose, you need to consult a doctor in time to avoid delaying your condition.