Yes, even though it's not a formal medical diagnosis. Period flu is the casual name for the flu-like symptoms a lot of people who menstruate get right before or during their period. It's tied to the hormone and prostaglandin shifts that happen in the late luteal and early menstrual phase, which can trigger inflammation, body aches, fatigue, nausea, and that overall under-the-weather feeling. So while you won't see it on a chart, the experience is very real and very common. If yours is intense or interferes with daily life, talk to a healthcare provider, there's no prize for toughing it out.
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