Signs of hypoglycemia include which of the following?

Hypoglycemia, or low blood sugar, can present with a range of symptoms that arise from the body's response to decreased glucose levels. Nausea and tachycardia are common indicators of this condition. When blood sugar levels drop significantly, the body triggers the release of adrenaline as a compensatory mechanism. This release can lead to feelings of nausea as well as an increased heart rate, or tachycardia, as it prepares to mobilize energy and address the perceived crisis of low glucose availability.

The other signs of hypoglycemia typically include symptoms like sweating, shakiness, fatigue, confusion, and irritability. While extreme thirst and frequent urination, chest pain and shortness of breath, and pain in the lower back may indicate other health concerns, they do not specifically manifest as symptoms of hypoglycemia. Thus, nausea and tachycardia effectively align with the body's response to low blood sugar levels, making this choice the correct identification of hypoglycemic signs.