Research has shown that the most frequent symptom of nervous instability among teachers is

Research finds explosive behaviour, sudden outbursts of temper, to be the most frequent symptom of nervous instability in teachers.

Digestive upsets are physical complaints, not the leading nervous symptom.

Fatigue is common but is not the specific marker identified.

Worry is a milder sign and not the most frequent one reported.

Teacher stress and burnout heighten emotional reactivity in class.

Emotional self-regulation is vital to a teacher's mental health.