That Vacation Cold Might Be About Stress, Not the Plane

Clock Out, Check In: You probably recognize the pattern: you push through a demanding stretch of work feeling fine, only to get sick just as your out-of-office autoresponse turns on. It’s easy to blame the office, a packed airplane, or bad timing. But research suggests something else may be at play — your body’s response to a sudden drop in stress.

Going Deeper: Researchers call this phenomenon “leisure sickness.” In one survey of more than 1,000 people, a statistically significant number of respondents reported getting sick most often on weekends or during vacations, especially in the first few days off. Other studies have found similar patterns with headaches that appear shortly after stress levels fall. One leading theory is that prolonged stress — and the hormones that come with it — can suppress symptoms, which then surface once the pressure eases.

Takeaway: There’s still much researchers don’t understand about leisure sickness. But evidence suggests that consistently supporting immune health matters. Regular physical activity, in particular, has been linked to fewer sick days, with one study.) finding that people who exercised were less likely to take sick leave than those who remained inactive.

Bottom Line: Powering through chronic stress and hoping time off will undo the damage is rarely enough. Protecting immune health appears to depend more on what you do before the break than after it.