Period flu tends to hit harder when prostaglandins (the inflammatory compounds your body releases to shed your uterine lining) are running high. More prostaglandins, more body-wide aches, nausea, and that wiped-out feeling. Stress, poor sleep, dehydration, and skipping meals can all amp it up, so can underlying stuff like endometriosis or thyroid issues that make every cycle rougher. If symptoms feel intense every cycle or interfere with daily life, it's worth checking in with a healthcare provider. Track your symptoms for a couple cycles, note what makes it better or worse, and bring that info to a healthcare provider. You don't have to white-knuckle it through every period, getting evaluated can open up real options.