Which of the following is a symptom of a diabetic emergency?

A fast heartbeat can be a symptom of a diabetic emergency, specifically in situations such as hypoglycemia (low blood sugar) or hyperglycemia (high blood sugar). When a person with diabetes experiences hypoglycemia, their body releases adrenaline in response to low blood sugar levels, which can increase heart rate. In cases of hyperglycemia, the body may go into a stress response that can also manifest as a rapid heartbeat. This symptom often accompanies other signs, such as sweating, confusion, and shakiness.

In contrast, high fever is more indicative of an infection or illness, swelling in the legs is often related to circulation or fluid retention issues, and a headache can arise from various causes not necessarily linked to a diabetic emergency. Understanding these specific symptoms helps in recognizing and responding appropriately to a diabetic emergency.