Mood swings and pregnancy hormones

Crying at an ad for home insurance. Snapping at your partner for chewing. Feeling euphoric at 10am and inexplicably bleak by lunch. If your emotions have started behaving like weather — sudden, changeable, out of your hands — welcome to one of pregnancy’s least-advertised symptoms. Mood swings are as normal as morning sickness, and they have real causes worth understanding, because understanding takes some of the sting out.

The hormonal part is real. Oestrogen and progesterone climb to levels your body has never run on before, and both influence the brain chemicals that regulate mood. The steepest climb happens in the first trimester — which is why the early weeks are often the most emotionally lurchy — with another turbulent patch in the third, as hormones shift again and the finish line nerves kick in. The comparatively steady second trimester is often calmer in mood, too.

But it’s not just chemistry. Consider the rest of the load: you’re exhausted, possibly nauseated, sleeping badly, maybe keeping a giant secret, and quietly processing one of the biggest identity shifts a person can go through — all at once. Anyone would wobble. Hormones lower the threshold; life supplies the triggers. It’s worth saying clearly: crying more than usual, being irritable with the people closest to you, and swinging between excitement and dread about the baby are all within normal range, and they don’t say anything about what kind of parent you’ll be.

What helps, practically: sleep, first and always — moods fray fastest when you’re running on empty; food at regular intervals — pregnancy blood-sugar dips make everything feel worse than it is; movement, even a ten-minute walk; saying it out loud (“today is a teary day, it’s not about you”) so the people around you can stop guessing; and dropping the standard of feeling grateful and glowing at all times — you’re allowed to find pregnancy hard while being glad you’re pregnant.

For partners: don’t fact-check the feeling, and don’t take the sharp edges personally. What lands best is boring and reliable — tea, snacks, an early night, “that sounds hard”, and not needing the mood to be fixed in order to stay close.

When it’s more than mood swings. The line to watch isn’t intensity — it’s persistence. Mood swings pass in hours; depression and anxiety settle in and stay. If you’ve felt flat, hopeless, numb or on-edge for more than about two weeks, if you’ve lost interest in things you normally love, if worry has become constant and physical, or if you’ve had thoughts of harming yourself — that’s not hormones being quirky, and it deserves real support. Antenatal depression and anxiety are common and very treatable, and catching them during pregnancy is genuinely protective for later.

Tell your midwife or GP how you’ve actually been feeling — they ask about mood at appointments precisely because they want the honest answer. And PANDA (1300 726 306, weekdays and Saturdays) exists for exactly these conversations, whether you’re in trouble or just not sure what counts. The weather passes; you don’t have to sit out the storms alone.