Cycle Science

Period flu isn’t in her head. Hormone shifts and prostaglandins can leave her achy, feverish and wiped out. Here’s the science, and how to actually help.

Her period’s late and your stomach drops. Here’s what ‘late’ actually means, the common non-pregnancy reasons, and how to be the calm, steady partner through the wait.

PMS vs PMDD isn’t just severity – one is a recognized disorder. Here’s how a partner can tell the difference and actually help.

The week she seems full of energy isn’t a mood – it’s the follicular phase. Here’s what rising estrogen does, and how to work with it.

The whole menstrual cycle explained plainly for partners and fathers – the four phases, the hormones behind them, and exactly what to do in each one. With consent and privacy built in.

Her sleep isn’t broken – it’s cycling. A phase-by-phase guide for partners: what changes in each part of the cycle, why, and what small things actually help.

It’s not willpower. It’s magnesium, serotonin, and a luteal-phase reward-seeking dip. Here’s what’s actually happening — and how to be useful.

Two hormones do most of the work behind her mood. Here’s the week-by-week map of what estrogen and progesterone are doing to her brain — and what helps from a partner each week.

Day 1 isn’t a single day. A field guide to what’s actually happening in her body the first five days of her cycle – and what your job is, biologically informed.

Ovulation explained for men: the hormonal peak of her cycle, why it matters even if you’re not trying to conceive, and how to spot the window without medical kit.