In a word, yes. Stress -- along with cold weather and climate changes or hormonal fluctuations like pregnancy -- are the major triggers for dandruff flare-ups.
If you’re noticing flakes, be sure to wash your hair every day, subbing in an over-the-counter dandruff shampoo a few days a week instead of your regular formula. Address the emotional component contributing to the condition by taking stock of what’s causing anxiety in your life. Then figure out some healthy outlets like exercise, meditation or some good old-fashioned fun to your regular routine to combat the stress.