Re: Could PMS cause a fever???
Assuming she is not on birth control pills, yes, it could cause a low-grade fever.
A lot of women (myself included), use a system of basal body temperature charting to track their cycles to become pregnant. Before ovulation, basal body temperatures are lower--mine were usually 97.0-97.5 degrees. After ovulation, as progesterone is released, the basal body temperature rises. I typically had basal body temps. over 98 degrees, closer to 98.6 degrees after ovulation. Basal body temps. are usually lower than your regular daily temp. because these temperatures are taken right upon waking up in the morning, before getting out of bed, before eating or drinking anything.
After ovulation, if I took my temperature during the day (out of curiousity), it was usually around 99-99.7 degrees. Although, usually, running this low-grade fever never made me feel sick. I'd feel fine other than normal PMS symptoms except sometimes, I would notice feeling very, very hot (especially in bed at night).