Pregnancy bloating: what causes it, how to get relief and the signs that need a doctor

If bloating and gas are making your pregnancy uncomfortable, your hormones are behind it. The NHS says progesterone loosens the muscles of your digestive tract, and KKH says your stomach empties more slowly in pregnancy. Smaller meals more often and loose, breathable clothes can ease it, KKH suggests. Severe tummy pain is a different matter, so see a doctor straight away.

The same slowdown can cause constipation, and your growing womb can cause heartburn by pressing on your stomach. Our guide to pregnancy aches and pains by trimester covers the other common complaints.

Why pregnancy makes you so gassy and bloated

Start with progesterone. The NHS says this hormone relaxes the muscles of your womb so it can grow with your baby. The muscles of your digestive tract loosen too. That's why you may feel bloated and find yourself burping or passing wind.

KKH gives a second reason. Its pregnancy planner says you may feel more bloated than usual because gastric emptying slows down, which means food leaves your stomach more slowly.

Your bowels slow down as well. HealthHub says rising progesterone slows the movement of your intestines, and a KKH dietitian calls constipation common in pregnancy for this reason. SingHealth's HealthXchange says your womb pressing on your bowels makes it worse. Late in pregnancy, KKH adds, your baby can press on your large intestine. Iron supplements can make constipation worse too, both HealthHub and KKH say, and so can drinking less when your appetite is poor.

Your growing womb also presses on your stomach. HealthHub says this can push acid back up into your food pipe, which is heartburn. Our heartburn guide covers what eases it.

Fluid can make you feel bloated too. SGH puts that feeling down to fluid retention, and says standing for long periods makes it worse.

So bloating can start early and hang around. KKH and the NHS both raise it in the first trimester, in their week 7 and week 10 pages. Later, your growing womb and baby add pressure on your stomach and bowels.

How to get relief from gas and bloating

Start with how you eat. KKH suggests smaller meals many times a day instead of a few big meals. The NHS suggests 6 small meals a day, plus these habits:

• Eat slowly and sip your fluids.
• Avoid eating late at night.
• Take a short stroll after meals.
• Avoid smoking and alcohol.

Put together, a gentler day might mean three smaller meals with snacks in between, so you reach the NHS's 6. Keep a water bottle within reach and sip from it through the day. Walk for a few minutes after lunch or dinner. Then finish your last meal well before bed.

KKH also suggests loose, breathable clothing for comfort. And don't cut back on drinks to feel less full. SGH says limiting fluids isn't the answer to fluid retention, and advises 2 litres of fluid a day. If your job keeps you on your feet, sit down when you can, since SGH says long periods of standing make fluid retention worse.

If you're constipated too

KKH's advice is high-fibre food, plenty of fluids and regular exercise. High-fibre foods on its list include wholemeal bread and cereals, fruit and vegetables. Swap in wholemeal bread or cereal, and add fruit or vegetables to your meals.

Drink with the fibre. A KKH dietitian warns that more fibre without enough fluid may make constipation worse, and suggests 8 to 10 glasses of fluid a day. Mild, regular activity such as walking or swimming may help your bowels move, the dietitian adds.

Can you take anything for gas while pregnant?

Possibly, but ask first. HealthHub's national leaflet on medicines for nausea and vomiting in pregnancy says you may take simethicone or an antacid for heartburn, gas or bloating. It doesn't give a dose there. Ask your doctor or pharmacist which one suits you and how much to take before you start.

Constipation has its own options. KKH says a stool softener can be prescribed if you need one, and its dietitian advises seeing your doctor for medication if the diet tips haven't worked. When you ask, mention everything you already take, iron and other supplements included, so it can all be checked together.

When to call your doctor about tummy pain and bloating

The NHS says tummy pain is probably nothing to worry about if it's mild and goes away when you change position, rest, do a poo or pass wind. Trapped wind is one harmless cause it names. If you're unsure, ask your doctor. Other pain needs quicker action:

Where to get checked in Singapore

Bring up everyday bloating at your next antenatal visit. Tell your doctor when it comes on, what you'd eaten and if you're also constipated. Our guide to prenatal check-ups and scans shows when those visits fall. Not sure if it's urgent? Check the table above. If your pain matches any row, don't wait for your next appointment.

For questions about simethicone or antacids, your doctor or pharmacist can tell you which suits you. If constipation won't shift, KKH says your doctor can prescribe a stool softener.

For urgent pain, KKH runs an Urgent O&G Centre at Women's Tower, Basement 1. KKH says to go there, or to your nearest hospital emergency department, if you have bad tummy pain or heavy vaginal bleeding. The NHS line about calling your maternity unit is written for the UK, so use these Singapore options instead. If you're booked at another hospital, ask at your next visit where to go after hours.

In the first 12 weeks, keep HealthHub's warning-signs page handy. Adapted from SGH, it lists severe tummy pain among the signs that need a doctor immediately, since it may be a sign of ectopic pregnancy.

Frequently asked questions

Is bloating normal in early pregnancy?

Both KKH and the NHS mention it in their early week-by-week pages. KKH's week 7 page says you may feel more bloated than usual, and the NHS's week 10 page links bloating and wind to progesterone. Our pregnancy week by week guide covers what else changes.

Why am I so gassy while pregnant?

The NHS says progesterone loosens the muscles of your digestive tract, which can mean more burping and wind. HealthHub says the same hormone slows your intestines, and KKH says your stomach empties more slowly. Eating slowly, sipping fluids and a short stroll after meals may help, the NHS suggests.

What can I take for gas while pregnant?

HealthHub's national medicines leaflet says you may take simethicone or an antacid for heartburn, gas or bloating. It doesn't give a dose. Ask your doctor or pharmacist before you take either.

Should I drink less if I feel bloated?

No. SGH says limiting fluids isn't the key to preventing fluid retention. It advises 2 litres of fluid a day. A KKH dietitian suggests 8 to 10 glasses, and warns that fibre without enough fluid may worsen constipation.

Can iron supplements make constipation worse?

Yes, say both HealthHub and KKH. If you take iron and you're constipated, tell your doctor. KKH says a stool softener can be prescribed if you need one.

What kind of tummy pain needs a doctor straight away?

Get help right away for severe lower tummy pain that comes with bleeding, fever or chills, trouble walking, nausea or vomiting, KKH says. For bad pain or heavy bleeding, go to KKH's Urgent O&G Centre or your nearest emergency department. Mild pain that eases with rest or passing wind is probably nothing to worry about, the NHS says.