Does low blood sugar cause confusion?

Written by Luo Juan
Endocrinology
Updated on October 21, 2024
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When hypoglycemia occurs, it is possible to experience confusion. This is because, under normal conditions, the glucose level in our brain tissue is only about 25% of that in our blood. After hypoglycemia occurs, the glucose concentration in our brain tissue will further decrease, leading to a state of sugar and oxygen deprivation in the brain. Severe cases can exhibit a range of neuropsychiatric symptoms such as behavioral changes and confusion, cognitive dysfunction, or even epileptic seizures. Some patients may also experience coma and permanent brain damage, typically seen in those with severe and prolonged hypoglycemia. Similarly, patients who repeatedly experience hypoglycemia often also suffer from brain atrophy. Therefore, confusion can occur during hypoglycemia.

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Endocrinology
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Is hypoglycemia dangerous?

For hypoglycemia that has already occurred, as long as we can accurately and promptly identify the onset of hypoglycemia and provide appropriate treatment, the hypoglycemia can be alleviated and cured. Occasional hypoglycemia is not very dangerous after being handled, but if hypoglycemia occurs frequently and does not receive timely rescue, it can cause significant damage to the human body, especially the central nervous system, causing damage to brain cells. If hypoglycemia lasts too long, it can even endanger life, leading to coma, death, etc.

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What to do about hypoglycemia?

After a hypoglycemic episode, we need to handle it quickly. Usually, based on symptoms of hypoglycemia, such as dizziness, palpitations, cold sweats, pale complexion, and trembling hands, we can preliminarily judge the likelihood of a hypoglycemic attack. Then, use a rapid glucose meter to measure fingertip blood sugar levels. For non-diabetic patients, a blood sugar level below 2.8 mmol/L and for diabetic patients, a level below 3.9 mmol/L can be indicative. Next, we quickly provide sugar, offering oral sugar water, sugary drinks, or sugar-containing fruits, cookies, bread, etc. After these treatments, the symptoms of hypoglycemia can be quickly alleviated.

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How to check for hypoglycemia

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.

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What to eat for low blood sugar?

For already occurring hypoglycemia, our treatment goal is to quickly alleviate the symptoms of hypoglycemia. The primary method is to provide sugar, either through sugar water, sugary drinks, or sugar-containing fruits, bread, etc. After providing sugar, the symptoms of hypoglycemia can be quickly relieved. At the same time, to prevent hypoglycemia, we need to do the following: first, eat meals regularly every day, avoiding eating too late or not enough. Second, it is not advisable to exercise on an empty stomach; it is appropriate to eat something before exercising. Third, avoid excessive alcohol consumption, as it can inhibit the conversion of liver glycogen into glucose in the body, making it easy to develop hypoglycemia, so avoid excessive drinking. Fourth, once common symptoms such as palpitations, dizziness, sweating, and other symptoms occur, we should quickly provide sugar.

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What are the symptoms of hypoglycemia?

The symptoms of hypoglycemia primarily manifest as signs of sympathetic nervous excitement and lack of oxygen in brain cells. Sympathetic nervous excitement can cause feelings of hunger, pale complexion, palpitations, dizziness, and trembling limbs. Meanwhile, the lack of oxygen in brain cells primarily presents as disturbances in neurological functions. The most common symptoms include inability to concentrate, slow speech and thought processes, drowsiness, abnormal behavior, and in severe cases, it can even lead to coma.