If there is a rise in blood sugar in summer, it may be caused by dietary factors, or it may be caused by diabetes, Cushing’s syndrome and other disease factors. 1. Dietary factors: the higher temperatures in the summer, the human body will tend to drink some drinks or eat ice-cream, and these drinks or ice-cream contain high sugar, after eating blood sugar will rise, especially for patients with diabetes after eating sugary foods, blood sugar will rise. 2. Disease factors: elevated blood sugar in the summer may also be caused by diabetes, patients with diabetes can have chronic hyperglycemia; Cushing’s syndrome patients with elevated levels of cortisol in the body, and a large amount of cortisol may antagonize insulin, but also reduces the peripheral tissues on the use of glucose, resulting in elevated blood sugar. It is recommended to seek medical attention if you have high blood glucose in the summer that exceeds the normal blood glucose range.