High blood sugar is typically characterized by the "three polys and one less."

The "three polys" refer to polydipsia (excessive thirst), polyphagia (excessive hunger), and polyuria (excessive urination), while the "one less" refers to weight loss.

At the same time, patients may experience general symptoms such as fatigue and listlessness.

If hyperglycemia persists over a long period, manifestations of chronic diabetic complications may also occur, such as decreased vision, numbness in the hands and feet, and weakness while walking.

Patients need to visit an endocrinology specialist for systematic diagnosis and treatment.