http://2learnhow.com/story.php?title=post-exertional-malaise If you find that activity makes your symptoms worse hours — or even a day — later, you may be experiencing post-exertional malaise (PEM). Many people describe PEM as a delayed crash after physical, mental, or emotional effort, where symptoms flare even after what seemed like a small task. Sat, 18 Jul 2026 11:40:39 UTC en