Loose Stools in Pregnancy: Why It Happens and What to Do

Loose stools or diarrhea in pregnancy may not be something that you should worry about. The fluctuating hormones of the body cause many different changes in the body, however, diarrhea is not one of them.

Pregnancy is famous for constipation, so it can feel faintly unjust when your body swings the other way and hands you loose stools instead. It’s less talked about, mildly undignified, and usually nothing sinister. Still, it’s worth knowing why it happens, how to look after yourself, and the few times loose stools in pregnancy are a signal rather than a nuisance. Here’s the plain guide.

Occasional loose stools in pregnancy are common and usually harmless, brought on by hormones, diet changes, or the body getting ready for labour near your due date. The main thing to guard against is dehydration. See a doctor if diarrhoea is severe, lasts more than a couple of days, or comes with fever, blood, or signs of dehydration.

Keep your fluids up. Everything else is mostly a matter of staying near a bathroom and keeping your sense of humour.

Why it happens

There’s rarely one dramatic cause. Loose stools in pregnancy tend to come from a mix of ordinary things:

Hormones. The same hormonal shifts that slow digestion for some women speed it up for others. Bodies are inconsistent like that.
Diet and prenatal changes. A sudden increase in fibre, fruit or water, or a new prenatal vitamin, can loosen things. So can foods that simply disagree with you now when they never did before.
An ordinary tummy bug or food that turned. Pregnancy doesn’t make you immune to the same stomach upsets everyone else gets.
Approaching labour. In the last days or weeks, many women notice looser stools as the body clears the decks before labour begins. It’s a normal, if unglamorous, part of the run-up.

How to look after yourself

Drink, and keep drinking. The real risk with loose stools is losing fluid. Sip water steadily, and use an oral rehydration solution if it’s frequent.
Eat gently. Plain, easy foods, think rice, toast, bananas and clear soups, are kinder to an unsettled gut than rich or greasy meals.
Ease off the likely culprits for a day or two: very high-fibre foods, sugary drinks, and anything you suspect set it off.
Rest. Your body is working hard enough. A day taking it easy near a bathroom is no bad thing.
Don’t reach for anti-diarrhoea medicine without asking your doctor or pharmacist first, since not all are suitable in pregnancy.

Common triggers to watch

If loose stools keep returning, it can help to play detective for a day or two. Common culprits include a sudden jump in fibre, very rich or spicy meals, artificial sweeteners, a large amount of fruit, or a new prenatal supplement. Ordinary food poisoning and tummy bugs cause it too, and pregnancy makes it more important to handle food safely: wash fruit and vegetables well, keep cooked and raw foods apart, and give leftovers a proper reheat. None of this means you did anything wrong. Digestion in pregnancy is simply less predictable than usual, and what your gut tolerated happily last month it may object to this month, for no obvious reason at all.

When to see a doctor

Most episodes settle on their own within a day or so. Contact your doctor or midwife if:

The diarrhoea is severe or lasts more than about two days.
There’s blood or mucus in your stools.
You have a fever, severe tummy pain, or vomiting alongside it.
You notice signs of dehydration: dark urine, passing very little, dizziness, or a dry mouth.
You’re near your due date and it comes with regular cramping or contractions, which may mean labour is starting.

Dehydration is the reason to act promptly, because it affects you and your baby. When in doubt, a quick call to your care provider settles it. Loose stools can also travel with other late-pregnancy signs, so it helps to know the difference between ordinary aches and the ones worth flagging, such as pregnancy back pain and groin pain.

A quick reassurance to end on: an isolated bout of loose stools, with no fever, no blood and no cramping, is almost always just your digestion having an off day. Keep drinking, eat plainly, and it typically rights itself within a day.

Common questions

Is diarrhoea normal in pregnancy?

Occasional loose stools are common and usually harmless, caused by hormones, diet changes or the body preparing for labour near your due date. The main thing is to stay hydrated and watch for warning signs.

Does diarrhoea mean labour is coming?

It can be one sign, especially in the last days or weeks, as the body clears out before labour. On its own it doesn’t confirm labour, but if it comes with regular cramping or contractions near your due date, contact your care provider.

What should I eat if I have loose stools while pregnant?

Plain, gentle foods like rice, toast, bananas and clear soups, and plenty of fluids. Ease off very high-fibre foods, sugary drinks and anything that seems to trigger it, for a day or two.

Can I take anti-diarrhoea medicine while pregnant?

Ask your doctor or pharmacist first, as not all anti-diarrhoea medicines are suitable in pregnancy. Often, fluids and gentle eating are all that’s needed.

When should I worry about diarrhoea in pregnancy?

If it’s severe or lasts more than about two days, or comes with blood, fever, severe pain, vomiting, or signs of dehydration like dark urine and dizziness. Then contact your doctor promptly.

The short version

Loose stools in pregnancy are common, usually harmless, and rarely discussed at brunch. Keep your fluids up, eat gently, rest, and ease off whatever set it off. The one thing to take seriously is dehydration, so watch for the warning signs and call your care provider if it’s severe, bloody, feverish, or paired with cramping near your due date. Otherwise, stay close to a bathroom and know that this too shall pass, in every sense.