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Fasting hypoglycemia is a condition characterized by abnormally low blood glucose levels that occur when a person has not eaten for a prolonged period. In healthy individuals, the body has a regulatory system involving insulin and glucagon produced by the pancreas to maintain stable blood sugar. When this system is impaired, or when there is an excess of insulin, blood glucose can drop too low.12

Symptoms of mild hypoglycemia include hunger, fatigue, tremors, rapid pulse, and anxiety. More severe cases can lead to blurred vision, confusion, seizures, and coma due to glucose deprivation in the brain. Causes can be insulin-dependent, such as tumors secreting insulin, or insulin-independent, involving impaired glucose mobilization during fasting due to conditions like liver disease or starvation. It is often a complication of diabetes mellitus treatment.134

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