Fear is loud, urgent, and rigid. It rushes through your nervous system with panic, tightness, and internal commentary ("You can't trust them," "You're going to fail," "Get out now"). Fear nearly demands immediate retreat or control.
Empathy and compassion are often used interchangeably as if they were the exact same emotion. However, they represent very different emotional responses. One of them is sustainable and healthy, while the other can lead to dysfunctional relating and profound burnout.