What are signs of severe hypoglycemia?

Severe hypoglycemia occurs when blood sugar levels drop significantly, leading to critical symptoms that require immediate attention. Unconsciousness and seizures are key signs of this condition. When the body's glucose supply is critically low, the brain and nervous system are adversely affected, which can manifest as a loss of consciousness. Seizures may also occur due to the disrupted electrical activity in the brain resulting from insufficient glucose, which is necessary for normal brain function.

The other options represent either mild symptoms of hypoglycemia or unrelated conditions. Increased appetite and energy, headaches and nausea, as well as weight gain and fatigue can indicate other health issues or milder fluctuations in glucose levels but do not reflect the severe, life-threatening state of hypoglycemia that includes seizures or loss of consciousness. Recognizing the signs of severe hypoglycemia is crucial for timely intervention, which can include administering glucose or glucagon, potentially saving the individual's life.