You can't fully stop period flu, but you can take the edge off. Period flu shows up because of the hormone shifts and inflammation that come with your cycle, so the goal is supporting your body, not fighting it. Rest when you can, hydrate more than you think you need, and lean on a heating pad for cramps and body aches. Gentle movement like walking or stretching may help ease symptoms, and eating regularly keeps energy steadier. Over-the-counter options can help with pain and fever-like feelings, just check with a pharmacist or your doctor on what's right for you. If symptoms knock you out every cycle, that's worth a conversation with a healthcare provider.