Metallic taste in pregnancy, plus loss of appetite, extra saliva, dry mouth and thirst: what's normal and when thirst means diabetes

A metallic taste in pregnancy is common and usually harmless. KKH's trimester guide lists a strange taste in your mouth among first-trimester symptoms, alongside new cravings, a sharper sense of smell and going off foods you used to like. Thomson Medical's doctors say the metallic taste usually starts around weeks 4 to 6 and is often gone by weeks 12 to 14. It often travels with other mouth changes: less appetite, extra saliva, a dry mouth. Thirst is the one to think about: feeling very thirsty can be dehydration from vomiting, and occasionally it's a sign of high blood sugar, though most women with gestational diabetes have no symptoms at all, which is why Singapore tests every pregnant woman at 24 to 28 weeks.

Five odd mouth symptoms at a glance

Metallic taste: why it happens and what helps

Thomson Medical's doctors compare it to sucking on a coin, even when you haven't eaten, and link it to the surge of pregnancy hormones, particularly oestrogen, progesterone and hCG, which fits with when it comes and goes. Thomson Medical's doctors point to two things that can make it worse: prenatal vitamins with a lot of iron, which can leave a metallic aftertaste, and a dry mouth from not drinking enough, which concentrates the taste.

• Try citrus: Thomson Medical suggests a slice of lemon or lime in your water, or orange juice, to cut through the taste.
• Switch to plastic or wooden cutlery if metal spoons make it worse.
• Brush your teeth and tongue, and rinse with water after meals.
• Drink water steadily; a dry mouth makes the taste stronger.
• Don't stop your prenatal vitamin. Thomson Medical suggests asking about a brand with less iron, a coated tablet or a gummy version. Our prenatal vitamins guide covers what you need.

See your doctor if the metallic taste carries on past 12 to 14 weeks or gets worse, or if it puts you off food to the point of losing weight or struggling to drink, as Thomson Medical advises.

Loss of appetite

Going off food is normal early in pregnancy. KKH's trimester guide says losing your appetite usually happens in the first trimester and settles later, and that 60% of pregnant women have food aversions. Its advice is simple: eat smaller, more frequent meals of foods you enjoy. Plain crackers, bread, rice porridge, fruit and cold foods with less smell are often easier.

You don't need to force big meals in the first trimester. Your energy needs only go up from the second trimester, and HealthHub puts the extra at about 300kcal a day then. If nausea is the main problem, our guide to morning sickness remedies in Singapore has KKH's tips, and our healthy pregnancy snacks list helps on days when meals feel impossible.

Extra saliva

Some women make a lot more saliva in early pregnancy, sometimes enough to keep swallowing or spitting. Thomson Medical notes you may produce more saliva than usual, or that it feels different. We found no Singapore hospital or HealthHub page that explains it further. It usually comes with nausea and tends to ease when the nausea does. Try sipping water, sucking ice chips or chewing sugar-free gum, and brush more often. Mention it at your check-up if it's stopping you eating or sleeping.

Dry mouth

The opposite problem is common too. Thomson Medical's dentists say pregnancy can decrease saliva, so your mouth feels dry and sticky, you're often thirsty, and your breath may smell. HealthHub's medicine leaflet adds that some anti-nausea medicines cause a dry mouth as a side effect. Saliva protects your teeth, so a dry mouth raises the risk of decay: drink water through the day, chew sugar-free gum and keep up brushing and flossing. Our guide to dental care during pregnancy covers check-ups and gum care.

Thirst: when it's a sign of diabetes in pregnancy

Being thirstier than usual is common in pregnancy, especially in Singapore's heat. Two causes are worth knowing about.

Dehydration from vomiting

HealthHub lists the signs of dehydration in pregnancy as feeling dry or very thirsty, feeling drowsy or unwell, and urine turning from light yellow to dark yellow or brown. If you're vomiting and see these signs, or HealthHub's other warning, losing more than 10% of your pre-pregnancy weight because you can't keep food down, see your doctor straight away. Severe vomiting in pregnancy can need a drip in hospital.

Gestational diabetes

This is high blood sugar that starts in pregnancy, often shortened to GDM. KKH's doctors say that when it does cause symptoms, they include increased thirst, peeing more, a bigger appetite and tiredness. But typically there are no symptoms, and the high sugar is found at a routine check. Thirst on its own is a poor guide, especially since KKH says up to 30% of pregnant women pee more often anyway. That's why Singapore tests everyone:

So if you're very thirsty, peeing much more than usual and unusually tired or hungry, tell your doctor. Don't wait for the 24-week test, because they can check your sugar sooner. If you've already been diagnosed, HealthHub's GDM advice includes drinking water, because thirst can be mistaken for hunger or a craving. Our guides to the gestational diabetes diet in Singapore and prenatal check-ups and scans explain what happens next.

When to see a doctor

Frequently asked questions

Is a metallic taste an early sign of pregnancy?

It can be. KKH's trimester guide lists a strange taste in the mouth among first-trimester symptoms, and Thomson Medical says it usually starts around weeks 4 to 6. A pregnancy test, not a symptom, confirms it.

How long does the metallic taste last in pregnancy?

For most women it lasts until the end of the first trimester and then fades. Thomson Medical says it's often gone by weeks 12 to 14. See your doctor if it lasts longer or gets worse.

Can prenatal vitamins cause a metallic taste?

Yes. Thomson Medical says vitamins with a lot of iron can leave a metallic aftertaste. Ask about a lower-iron brand, a coated tablet or a gummy, rather than stopping.

Is it normal to lose your appetite in early pregnancy?

Yes. KKH says it usually happens in the first trimester and settles later, and that 60% of pregnant women have food aversions. Eat small, frequent meals.

Does being thirsty mean I have gestational diabetes?

Not usually. Most women with gestational diabetes have no symptoms, KKH says, so Singapore tests all pregnant women at 24 to 28 weeks. Tell your doctor if strong thirst comes with peeing more and tiredness.

What causes a dry mouth in pregnancy?

Pregnancy can reduce saliva, Thomson Medical's dentists say, and some anti-nausea medicines cause dry mouth. Drink water through the day and chew sugar-free gum.