Tom is very anxious about an upcoming exam. He has no appetite, is easily distracted, and has a headache. In what stage of the general adaptation syndrome is Tom?

The answer is the alarm reaction stage.

Explanation:

This stage reflects the physiological changes the body experiences in a stressful situation. It's a natural reaction that seeks to protect the body from further damage. Some of the symptoms include increased heart-rate and adrenaline production, which may cause headaches and other unpleasant sensations when they wear out.