Which symptoms indicate a hypoglycemic reaction after insulin administration?

A hypoglycemic reaction after insulin administration is characterized by symptoms that arise from low blood sugar levels. The correct choice highlights confusion and tremors, which are common neurological manifestations of hypoglycemia. When glucose levels fall, the brain does not receive enough energy, leading to cognitive disturbances such as confusion. Tremors can occur as a physiological response to the drop in blood sugar, as the body attempts to elevate glucose levels through the release of adrenaline.

Other symptoms often associated with hypoglycemia include palpitations, sweating, irritability, and dizziness. These symptoms stem from the body's attempt to counteract the low glucose levels and stimulate glucose production or facilitate glucose uptake.

The other choices highlight different conditions:

• Fever and chills are more indicative of an infection or inflammatory process, not a low blood sugar reaction.

• Increased thirst and urination point towards hyperglycemia, which is associated with uncontrolled diabetes rather than hypoglycemia.

• Severe headache and nausea can be symptoms of various conditions, including migraines or gastrointestinal issues, but they are not specific indicators of hypoglycemia.

Thus, confusion and tremors serve as direct indicators of hypoglycemia following insulin administration, effectively demonstrating the body's response to decreased glucose availability.