What is a sign of low glucose levels in the blood?

Low glucose levels in the blood, a condition known as hypoglycemia, often present with symptoms such as fatigue and weakness. This occurs because glucose is the primary source of energy for the body's cells, particularly muscle and brain cells. When glucose levels drop, the body doesn't have enough energy to function properly, leading to feelings of tiredness, weakness, and lethargy. These symptoms are a direct response to insufficient energy availability.

In contrast, other signs such as increased appetite, frequent urination, and weight gain typically do not occur due to low glucose levels. Increased appetite may happen as the body attempts to compensate for low energy but is not a direct indicator of hypoglycemia. Frequent urination is more commonly associated with conditions like diabetes, where high glucose levels lead to excess glucose being excreted through urine. Weight gain is generally linked to excessive calorie intake or hormonal imbalances rather than low blood glucose levels. Thus, fatigue and weakness serve as the more accurate representation of low glucose levels in the blood.