It can do both, depending on how and why you play. For some people, poker relieves stress by offering focus, challenge, and a mental escape, especially when played casually with good bankroll control. For others, it increases stress due to variance, bad beats, financial pressure, or emotional attachment to results. Poker tends to amplify your mindset—if you’re calm and disciplined, it can be enjoyable and engaging; if you’re anxious or chasing outcomes, it quickly becomes stressful. Managing expectations and knowing when to stop are key to keeping poker on the healthy side.