These are inseparable concepts. If headache is severe enough to send an employee home, productivity falls precipitously. If an employee takes needless breaks, productivity fails equally. Excess stress leads to illness, illness to absenteeism, absenteeism to turnover. Nor, nor would we want to do so.
Stress is a useful tool.
But we must bring it down to tolerable, healthy levels. Stress keeps us alert to impending danger. Physical stresses, such as headache and noise, evoke biological reactions. Psychological stresses, such as feeling out of control and job insecurity, evoke psychological defenses. Some stresses evoke both types of reactions.