Low blood sugar at 5:00 p.m. is first considered to be related to the use of insulin drugs, or eating too little at noon, excessive exercise in the afternoon, etc. It is recommended to consult a doctor for a clear diagnosis under the guidance of the doctor, and then treat the cause of the disease. 1. Use of insulin drugs: If you use long-acting insulin at noon or in the morning, hypoglycemia may occur in the afternoon, so it is recommended that patients monitor their blood glucose levels, and it is also necessary to determine whether there is a certain relationship between hypoglycemia caused by excessive use of insulin. 2. Eating too little at noon: patients eat too little at noon can also lead to hypoglycemia, so that the glucose in the afternoon can not supply the normal metabolism of the human organs, there will be clinical symptoms of hypoglycemia, it is recommended to pay attention to a diversified diet at lunch, pay attention to a reasonable diet, appropriate intake of eggs, milk and other protein foods. 3. Excessive exercise in the afternoon: excessive exercise in the afternoon will consume glucose in the body, so after strenuous exercise may induce hypoglycemia, it is recommended not to excessive strenuous exercise. If you find that your blood glucose level drops, consult the endocrinology department of a regular hospital to find out the cause.