Why is fasting blood sugar high? These two reasons are the most common

When fasting, many people's blood sugar levels are high, and some people are particularly concerned about the problem of high fasting blood sugar. So, why is fasting blood sugar high?

1. Insufficient dosage of hypoglycemic drugs

This is the most common clinical situation, characterized by blood sugar levels that remain higher than normal after dinner or after going to bed late, and a significant increase in fasting blood sugar levels the next morning. This occurs because the dose of hypoglycemic drugs (including insulin or insulin secretagogues, etc.) used before dinner or before going to bed is insufficient and cannot effectively control postprandial blood sugar at a normal level.

2. Rebound morning fasting hyperglycemia

Its characteristic is that the patient has too low blood sugar at night. Under the stimulation of hypoglycemia, the secretion of hormones that antagonize insulin, such as glucagon, adrenaline, corticosteroids and growth hormone, increases in the body, but the patient's body cannot increase insulin secretion accordingly to counteract the effects of these glucose-raising hormones, thereby causing blood sugar to gradually increase and lead to fasting hyperglycemia in the morning.

This situation mostly occurs after the patient falls asleep, and the symptoms are mild and there is no feeling. However, there are also more serious situations, such as the patient may wake up due to symptoms such as hunger, palpitations, sweating, etc. At this time, if the blood sugar is measured immediately, the value is often lower than 2, 8mmoI/L. The main reason for this situation is excessive use of hypoglycemic drugs.