Lots of women suffer some form of premenstrual syndrome when that time of the month rolls around. Sad news: If you suffer from PMDD (Premenstrual dysphoric disorder, the most severe form of PMS), your cat may be to blame.
Your Cat May Be Making Your PMS Worse (Just Because She Can)
Other studies have linked toxoplasma gondii to mental health issues like schizophrenia, but the study linking it to PMDD is new and the researchers caution people not to read too much into the results until further study can be done. In their study, they did find that women infected with the parasite experienced symptoms associated with PMDD, but more research needs to be done before a conclusive link could be determined.
In the meantime, be extra careful cleaning Fluffy's litter box (because, yeah, that's how you'd likely pick up the parasite).