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How common is it to be so tired the week before and during your period that you have to leave work or can't enjoy life? I know being tired is a common PMS symptom, but this feels debilitating. I was recently diagnosed with hypothyroidism (and am on medication for it), so being tired is what I have known practically my whole life, but it's so much worse leading up to my period.
I’m sorry to hear that your period is affecting your quality of life so much. Fatigue right before one’s period can be a normal PMS symptom as our serotonin levels (our “happy” hormone) can fluctuate and this can cause increased fatigue. Roughly two percent of women have PMDD (premenstrual dysphoric disorder) and they can experience high levels of fatigue, mood fluctuations, extreme sadness that start from ovulation right up to the beginning of their period. I would suggest tracking when your fatigue starts and when it ends over a few cycles and bringing that information to your primary care provider so they can help you identify the root cause and work with you to find ways to deal with this.