We usually diagnose hypoglycemia based on the following three criteria. The first is the presence of hypoglycemic symptoms, such as palpitations, tremors, sweating, dizziness, etc. If these symptoms are present, we must immediately consider the possibility of hypoglycemia, and then proceed to monitor blood glucose levels. If the blood glucose reading is below 2.8 for non-diabetic patients and below 3.9 for diabetic patients, hypoglycemia can be considered. Subsequently, the patient should consume sugary water, and if the symptoms significantly alleviate after this, a diagnosis of hypoglycemia can be established. Moreover, if the patient does not have a history of diabetes, does not use hypoglycemic drugs, but experiences recurring episodes of hypoglycemia, further testing is required, such as a fasting test, checking C-peptide levels, insulin levels, etc., to rule out insulinoma.