Pregnancy brings many changes to the body. Nausea, tiredness, mild backache, heartburn, breast tenderness and occasional discomfort can all occur during a healthy pregnancy.
But some symptoms deserve prompt medical attention.
Knowing the important warning signs during pregnancy can help you recognize when something is different from your usual pregnancy experience and when you should contact your obstetrician or seek urgent medical care.
A warning sign does not automatically mean that something is seriously wrong. Many symptoms have harmless explanations. However, symptoms such as vaginal bleeding, severe abdominal pain, persistent headache, changes in your baby's movements or leaking fluid should not simply be ignored.
Here are 10 pregnancy warning signs every expectant mother and family should know.
1. Vaginal Bleeding During Pregnancy
Light spotting can sometimes occur during pregnancy, particularly in the early weeks. However, new, persistent or heavier vaginal bleeding needs medical assessment.
What might it look like?
You may notice:
• Bleeding heavier than spotting
• Bleeding similar to a menstrual period
• Blood clots
• Bleeding accompanied by abdominal or pelvic pain
Why can bleeding be concerning?
Depending on the stage of pregnancy and other symptoms, bleeding may be associated with conditions including miscarriage, ectopic pregnancy, problems involving the placenta or other pregnancy complications.
Bleeding does not always mean pregnancy loss, so avoid assuming the worst. The cause needs to be assessed by a healthcare professional.
When should you contact your doctor?
Inform your obstetrician about vaginal bleeding during pregnancy, especially if it is new or unexplained.
When should you seek urgent medical care?
Seek urgent assessment for heavy bleeding, or bleeding accompanied by severe abdominal pain, fainting, significant dizziness, weakness or feeling very unwell.
CDC lists vaginal bleeding greater than spotting among urgent maternal warning signs.
2. Severe or Persistent Abdominal Pain
Mild stretching sensations and occasional cramps can happen as pregnancy progresses. But severe, sudden or persistent abdominal pain should not be dismissed as a normal pregnancy symptom.
What should you watch for?
Pay attention to:
• Sharp or stabbing pain
• Persistent pain that does not improve
• Severe one-sided pelvic or abdominal pain
• Upper abdominal pain
• Pain associated with bleeding, dizziness, fever or vomiting
What could cause it?
The possible causes vary depending on the stage of pregnancy. They can include pregnancy-related problems such as ectopic pregnancy or placental complications, but abdominal pain can also result from conditions unrelated to pregnancy.
Upper abdominal pain, particularly when associated with severe headache, vision changes or high blood pressure, may also occur with severe pre-eclampsia.
When should you seek help?
Contact your obstetrician for persistent or unusual abdominal pain.
Severe pain, rapidly worsening pain, or pain associated with heavy bleeding, fainting or breathing difficulty warrants urgent medical assessment.
3. Severe Headache or Changes in Vision
Headaches can occur during pregnancy, but a severe headache that does not go away or becomes progressively worse needs attention.
Vision changes are particularly important.
Warning symptoms include:
• Blurred vision
• Seeing spots or flashing lights
• Temporary loss or disturbance of vision
• Headache associated with sudden swelling
• Headache with upper abdominal pain
These symptoms can sometimes be associated with pre-eclampsia, a pregnancy-related hypertensive disorder that usually develops after 20 weeks.
WHO identifies severe headaches and visual disturbances among possible symptoms of pre-eclampsia.
What should you do?
Contact your obstetrician promptly if you develop a severe or persistent headache, particularly after 20 weeks of pregnancy.
Seek urgent medical care if the headache is extremely severe or is associated with significant vision changes, seizures, confusion, severe abdominal pain or severe illness.
4. Your Baby Is Moving Less Than Usual
Feeling your baby's movements is an important part of pregnancy.
Most women begin noticing fetal movement between approximately 16 and 24 weeks, although the timing varies.
As pregnancy progresses, become familiar with your baby's normal pattern of movement rather than comparing movement counts with another pregnancy.
When should you worry?
Contact your maternity team immediately if:
• You cannot feel your baby moving
• There is a noticeable change in your baby's normal movement pattern
There is no single number of movements that is normal for every baby. A change from your baby's usual pattern is what matters.
Do not wait until the following day to see whether movements return to normal.
Also, do not rely on a home Doppler or heartbeat-monitoring device as reassurance that your baby is well.
Reduced or absent fetal movements require prompt professional assessment.
5. Fluid Leaking From the Vagina
During pregnancy, vaginal discharge often increases. However, a sudden gush or continuous trickle of watery fluid may indicate that the membranes surrounding the baby have ruptured — commonly described as the "waters breaking."
It does not always happen as a dramatic gush. Sometimes it can be a persistent trickle.
Contact your maternity team if:
• Your underwear repeatedly becomes wet with watery fluid
• You are uncertain whether your waters have broken
If this happens before 37 weeks, urgent assessment is particularly important because it may represent preterm pre-labour rupture of membranes.
NHS guidance recommends urgent maternity assessment for suspected premature labour or waters breaking before 37 weeks.
Seek prompt medical attention if leaking fluid is accompanied by fever, bleeding, abdominal pain, contractions, reduced fetal movements, or if the fluid appears unusual or has an unpleasant smell.
6. Persistent or Severe Vomiting
Nausea and vomiting are common during early pregnancy. For many women, "morning sickness" is uncomfortable but manageable.
However, frequent vomiting that prevents you from keeping down food or fluids is different.
Warning signs include:
• Being unable to keep fluids down
• Very dark urine or passing very little urine
• Dizziness or light-headedness
• Significant weakness
• Signs of dehydration
• Weight loss
Severe pregnancy sickness may be caused by hyperemesis gravidarum, which can require medical treatment and sometimes hospital care.
The NHS advises women who are frequently vomiting and unable to keep food down to seek medical advice because dehydration can occur.
When should you contact your doctor?
Contact your obstetrician if vomiting is persistent, worsening or preventing adequate eating and drinking.
Seek urgent assessment if you are unable to keep fluids down, are fainting, severely weak or showing significant signs of dehydration.
7. Fever or Feeling Seriously Unwell
Pregnancy does not protect you from infections, and some infections may need quicker assessment during pregnancy.
Contact your doctor if you develop a significant fever, particularly when it is persistent or accompanied by:
• Severe weakness
• Abdominal or back pain
• Pain or burning while urinating
• Persistent vomiting
• Breathing problems
• Rash
• Reduced fetal movements
WHO includes high fever among important pregnancy danger signs.
Do not self-medicate with antibiotics or other medicines without professional advice.
If you have a high fever and feel extremely unwell, weak, confused, faint or short of breath, seek urgent medical assessment.
8. Difficulty Breathing, Chest Pain or a Very Fast Heartbeat
Some breathlessness can occur as pregnancy advances. However, sudden, severe or worsening breathing difficulty should never simply be attributed to pregnancy.
CDC includes trouble breathing and chest pain or a fast-beating heart among urgent maternal warning symptoms.
Seek urgent medical attention for:
• Difficulty breathing while resting
• Chest pain or pressure
• Fainting or severe dizziness
• A very fast or pounding heartbeat associated with feeling unwell
• Breathing difficulty that is rapidly worsening
These symptoms can have several causes and need professional evaluation rather than self-diagnosis.
9. Sudden or Severe Swelling of the Face or Hands
Mild swelling of the feet and ankles can occur during pregnancy, particularly later in pregnancy.
However, sudden or marked swelling — particularly involving the face or hands — deserves attention, especially when accompanied by other symptoms.
Watch for swelling together with:
• Blurred vision or flashing lights
• Upper abdominal pain
• Nausea or vomiting later in pregnancy
• High blood pressure
This combination can be associated with pre-eclampsia.
WHO lists swelling of the hands and face among potential symptoms associated with pre-eclampsia. Contact your obstetrician promptly if you notice sudden or unusual swelling. If it occurs together with severe headache, significant visual disturbance, severe upper abdominal pain, breathing difficulty or seizures, seek urgent medical attention.
10. Signs of Premature Labour Before 37 Weeks
Labour occurring before 37 completed weeks of pregnancy is considered preterm labour.
Possible warning signs include:
• Period-like cramps
• Persistent pelvic pressure
• Unusual lower backache
• A gush or trickle of fluid
• Vaginal bleeding
• A noticeable change in vaginal discharge
NHS guidance recommends contacting maternity services if you are under 37 weeks and develop regular contractions, period-like pains, unusual backache or leaking fluid. Do not wait for contractions to become extremely painful before asking for advice.
Early assessment can determine whether labour has actually begun and whether further monitoring or treatment is needed.
Pregnancy Warning Signs: When Should You Go to the Hospital?
As a simple rule, seek urgent medical assessment when a symptom is severe, sudden, rapidly worsening, or accompanied by significant bleeding, fainting, breathing difficulty, seizures or a major change in your baby's movements.
Contact your obstetrician or maternity team promptly if you notice:
• Severe or persistent abdominal pain
• Severe headache or vision changes
• Reduced or absent fetal movements
• Suspected leaking of amniotic fluid
• Persistent vomiting or dehydration
• Significant fever
• Sudden or severe swelling
• Possible premature labour
If you are uncertain whether a symptom is serious, it is safer to speak with your maternity healthcare team rather than trying to diagnose the problem yourself.
Who May Need Extra Monitoring During Pregnancy?
A high-risk pregnancy means that the mother, baby or both may have a greater chance of developing certain complications. It does not mean that complications will definitely occur or that a healthy pregnancy and birth are impossible.
Some women simply need additional monitoring.
Factors that may make a pregnancy higher risk include:
• High blood pressure or hypertension
• Diabetes or gestational diabetes
• Twin or multiple pregnancy
• Previous pregnancy complications
• History of pregnancy loss or recurrent miscarriage
• Placental problems
• Problems with fetal growth
• Certain heart, kidney or other maternal medical conditions
• Complications that develop during the current pregnancy
ACOG notes that maternal age over 35, diabetes, high blood pressure, heart conditions, fetal concerns and other pregnancy complications can lead to a pregnancy being classified as higher risk.
Women with high-risk pregnancies may require more frequent antenatal appointments, additional ultrasound examinations or fetal monitoring depending on their individual situation.
Regular antenatal care is important even when you feel completely well because some pregnancy complications may initially cause few or no noticeable symptoms.
WHO recommends regular antenatal contacts to monitor maternal health and fetal development and identify potential complications.
Frequently Asked Questions About Pregnancy Warning Signs
Important pregnancy warning signs include vaginal bleeding, severe abdominal pain, severe or persistent headache, vision changes, reduced fetal movements, leaking fluid, persistent vomiting, fever, breathing difficulty, sudden swelling and signs of premature labour.
Seek urgent medical assessment if you develop severe bleeding, severe or worsening abdominal pain, breathing difficulty, chest pain, seizures, fainting, significantly reduced or absent fetal movements, or other severe or rapidly worsening symptoms.
No. Light spotting can occur for different reasons and does not automatically indicate pregnancy loss. However, bleeding during pregnancy should be discussed with your healthcare professional, and heavy bleeding or bleeding with severe pain, dizziness or fainting needs urgent assessment.
A pregnancy may be considered higher risk because of maternal age, existing medical conditions, high blood pressure, diabetes, multiple pregnancy, previous pregnancy complications or problems that develop during the current pregnancy. Your obstetrician determines your individual risk.
Once you regularly feel your baby moving, seek maternity assessment promptly if movements become less frequent than usual, stop or show a noticeable change from your baby's normal pattern. Do not wait until the following day.
Occasional mild discomfort can occur, but severe, persistent or worsening abdominal pain should not be considered normal without medical assessment. Seek urgent care if it is accompanied by bleeding, fainting, fever, breathing difficulty or severe illness.
Reduced fetal movements, vaginal bleeding, leaking fluid, severe headache, vision changes, sudden swelling, severe abdominal pain and contractions before 37 weeks are among the symptoms requiring prompt medical advice.
Yes. Being classified as high risk means additional attention may be necessary; it does not predict the outcome of the pregnancy. Appropriate antenatal monitoring and individualized medical care help clinicians identify and manage potential problems.
Mild swelling of the feet or ankles can occur. Sudden or significant swelling of the face or hands, especially with headache, vision changes or upper abdominal pain, should be reported promptly because these symptoms may occur with pre-eclampsia.
Contact your obstetrician or maternity healthcare team. Pregnancy symptoms can overlap with both normal changes and medical problems, so professional assessment is safer than trying to diagnose the cause yourself.