Pre-eclampsia: signs and treatment


Pre-eclampsia affects about 6% of pregnancies, and 1-2% of pregnant women will experience a more severe form. But what is it, what symptoms should you look out for, and what treatment can you expect if you develop pre-eclampsia during your pregnancy?

Preeclampsia signs | What causes preeclampsia | Treatment for preeclampsia | Eclampsia | HELLP syndrome

What is pre-eclampsia?

Pre-eclampsia stops the placenta from functioning as it should, restricting the flow of oxygen to the organ. As well as negatively affecting your health, it also means that your baby will not receive enough oxygen or nutrients, which can lead to complications.

Pre-eclampsia signs

  • protein in your urine
  • high blood pressure

These two are usually the first signs of pre-eclampsia. High blood pressure, otherwise known as hypertension, is one of the most common symptoms, which is why your midwife will check yours at routine antenatal appointments. If you notice either of these symptoms or are generally worried about your health during pregnancy, do tell your doctor or midwife. They will perform a simple urine test to check for protein.

Sometimes high blood pressure is the only pre-eclampsia symptom present, and the condition usually develops later on in pregnancy, but after about 20 weeks, you could experience some of the below:

  • headaches
  • unexpected weight gain caused by water retention
  • sudden swelling of the hands, feet or face
  • vision problems, including flashing lights
  • severe heartburn that isn't improved by over-the-counter medicine
  • upper abdominal pain
  • nausea
I had no symptoms I was aware of other than swelling, which I had for weeks before I was diagnosed. I went for my routine midwife appointment and had raised protein in my urine and high blood pressure – she sent me straight to the hospital. They induced me straight away.

Some women might experience pre-eclampsia headaches, which are severe but non-migrainous. The major differences between severe headaches and migraines is that a severe headache feels like a dull pressure, as opposed to the throbbing or pulsing pain of migraines. You will often experience other symptoms during a migraine headache, like flashing lights, nausea or dizziness.

Not all women with pre-eclampsia experience headaches, and of course they can be completely unrelated – but it's definitely worth flagging these with your doctor or midwife, particularly if you didn't suffer from them before you became pregnant.

Pre-eclampsia causes

It’s not entirely clear what causes pre-eclampsia, but it's thought that a problem with the blood supply to the placenta prevents it from developing properly. There are also certain risk factors which increase your chances of developing it.

If you have a preexisting health condition such as diabetes, kidney disease, high blood pressure, PCOS or lupus, you're at an increased risk of developing pre-eclampsia, according to NHS guidelines. Likewise, if you've previously had pre-eclampsia, there’s a moderate chance you will develop the condition again in later pregnancies.

Other factors that can increase your chances of developing pre-eclampsia are being over 40, being very overweight, having a large gap between pregnancies (10 years plus) and expecting multiple babies. There's also a genetic link, so if there’s a family history of the condition, do let your midwife or doctor know.

Can I prevent or reduce the risk of pre-eclampsia?

Unfortunately, there’s no surefire way to prevent pre-eclampsia, but rest assured that once it is diagnosed you will be closely monitored. If you're currently obese and trying to conceive, you can reduce your risk by losing weight before you get pregnant. Eating a healthy diet and staying active is a step in the right direction, and could reduce your chances of developing high blood pressure, too.

When does pre-eclampsia start?

Pre-eclampsia usually appears after the 20th week of pregnancy, and is most commonly seen in the final trimester, but it can occur earlier or even after your baby is born, so if you have any concerns, it’s always best to speak to your GP for some reassurance.

Very rarely, women go on to develop eclampsia itself, which can cause seizures and be life-threatening for you and your baby. Pre-eclampsia can develop in previously trouble-free pregnancies, and it’s worth familiarising yourself with the symptoms so you can spot them if necessary.

How is pre-eclampsia treated?

Following a diagnosis of pre-eclampsia, it is likely you will be admitted to the hospital so doctors can assess how severe your case is. Most cases are relatively mild, with severe pre-eclampsia affecting only 1-2% of pregnancies.

Mild pre-eclampsia

Doctors will monitor your blood pressure closely, and take blood tests to check for any complications. Depending on the results of these tests, you may be able to go home and rest, attending further monitoring appointments as an outpatient, or you may be kept in for observation.

Moderate pre-eclampsia

blood pressure medication

You’ll be monitored similarly to above, but also given medication to lower your blood pressure and have ultrasound scans to measure the blood flow from the placenta to your baby. If your baby is well and your condition improves, you may be able to go home before the birth. If you haven’t had the baby by your 39th or 40th week, you may be offered an induction.

Severe pre-eclampsia

With severe pre-eclampsia, it is likely you’ll need to stay in hospital where you can be monitored closely. Doctors will take frequent blood pressure, urine and blood tests, as well as giving you medication to control your blood pressure. Your baby’s growth and wellbeing will be closely monitored, as will his or her heart rate.

I went from absolutely fine to my liver failing entirely within four hours.

Hospital staff will do everything within their power to prevent you from developing complications, and it is likely they will control your fluid levels. You may also be put you on a magnesium sulphate drip to lower your risk of developing eclampsia and fitting.

In some cases, your baby may need to be born earlier than expected – your doctor will assess your situation carefully, and explain all your options. You may be advised to have an induction or a caesarean around the 37th week, or earlier in extreme cases.

Will pre-eclampsia harm my baby’s development?

Worried pregnant woman at consultation

Premature births

There is a moderate chance that your baby will be born prematurely if you suffer from pre-eclampsia. Premature births have been linked to various lifelong challenges, but try not to panic too much. Your doctor should be able to help advise you about how a premature birth could affect you and your baby.

Intrauterine Growth Restriction

Because pre-eclampsia restricts blood flow to the placenta, it can also limit the supply of food to your baby, which is referred to as Intrauterine Growth Restriction (IUGR). As a result, your baby may become malnourished or small for its gestational age.

Ultrasound scans can help identify IUGR, and many babies who suffer from it will catch up on their growth within a few months. However, recent research does suggest that growth restricted infants are more prone to developing diseases later in life such as diabetes, congestive heart failure and hypertension. It’s important to not blame yourself if your baby does develop IUGR – it’s related to a failing placenta, and you can be eating a perfectly healthy diet and still develop it.


Acidosis is another potential result of pre-eclampsia, in which your baby’s body produces too much lactic acid and becomes unconscious in the womb. In this instance, delivery is essential even if the baby is premature.


There is also a small chance of stillbirth, particularly if you suffer from severe pre-eclampsia, HELLP syndrome or pre-eclampsia superimposed on chronic hypertension. This means it is essential to detect pre-eclampsia early and to monitor it accordingly. If you have any worries at all, it’s definitely worth speaking to your GP or midwife, who will be able to advise you.

What other complications could pre-eclampsia lead to?

Severe pre-eclampsia can lead to various complications, including Eclampsia, HELLP syndrome – which is why it is so important that the symptoms are identified early so you can be monitored and treated.


Eclampsia is a rare but serious condition where the membranes of your brain become irritated. This can lead to seizures, which put both you and your baby at risk. Eclampsia can develop during pregnancy and birth, as well as in the first few days and weeks after your baby’s birth, particularly if your pre-eclampsia was severe.

This might sound scary, and eclampsia is a severe illness, but it is a very rare complication in the UK – and once pre-eclampsia has been diagnosed, you will be closely monitored, and your medical team will do everything they can to prevent complications.

pregnant woman with eclampsia

HELLP syndrome

I had severe pre-eclampsia leading to HELLP syndrome – I was very lucky not to have convulsions. My reflexes were amazing – if someone touched my knee my whole leg flew up in the air uncontrollably. This is a sign of cerebral irritability which means that you are very likely to fit.

HELLP syndrome is a rare liver and blood-clotting disorder, which can develop before pre-eclampsia has been diagnosed.

HELLP stands for:

Haemolysis, which means the breaking down of red blood cells.

ELevated liver enzymes, which is a sign that your liver is not working properly.

Low Platelet count, which means your blood may not clot as easily as it should.

HELLP is most likely to develop immediately after you give birth – particularly if you have had severe pre-eclampsia – but it can sometimes develop from mid-pregnancy onwards, or in rare cases, even earlier. While it is a serious condition, once the baby has been delivered, and you are receiving medical care, it is possible to make a full recovery.

Other complications

It is possible to suffer any of these complications as a result of pre-eclampsia, though they are rare:

  • liver and kidney failure
  • stroke (cerebral haemorrhage)
  • fluid in the lungs (pulmonary oedema)
  • blind patches

However, your midwife and doctor will be looking out very carefully for symptoms of pre-eclampsia, and if you have been diagnosed you will be monitored very closely, so it is very unlikely you will experience any of these problems. But do make sure you attend all of your antenatal appointments, and raise any concerns with your midwife or GP – even if they seem small.

Will I make a full recovery from pre-eclampsia?

Most women make a full recovery from pre-eclampsia once they have given birth, but it is likely you will have to stay in the hospital for a few days to rest and have your blood pressure monitored.

Newborn and mother

All being well, your blood pressure will return to normal within weeks of having your baby. Routine checks following birth may show that you had high blood pressure before you were pregnant, and you may be given medication or advice to treat this.

Rare complications such as eclampsia or HELLP can have a long-term impact on your health, such as causing kidney problems, but most cases of pre-eclampsia are diagnosed and treated quickly, preventing these complications.

If you have had severe pre-eclampsia or eclampsia, your doctor will explain to you what happened, and how this might affect future pregnancies. Pre-eclampsia does put you at risk of developing high blood pressure and related problems in later life, so you will be encouraged to have regular blood pressure checks in future.

Pre-eclampsia support and information

What Mumsnetters are saying

''I went to the doctors at 36 weeks with pre-eclampsia and was admitted to hospital the same day. I had a C-section at 37 weeks.''

''My baby was small and not growing properly. That gave it away.''

''I felt awful – huge swollen feet, light-headed, tired, pain above and below my ribs, violently sick and I had awful heartburn.''

''My consultant told me that a C-section isn't necessary unless I or my baby rapidly deteriorated and there was no time for an induction.''

''I was diagnosed at 36 weeks and admitted to hospital as my blood pressure was very high. They controlled it with medication and told me that within a week (either naturally or via induction) my baby would be born. They released me five days later and within two days my baby arrived naturally. She weighed 5lbs 6ozs, so we had to stay in hospital for a couple of days. After that, everything was fine and dandy.

''Pre-eclampsia is very unpredictable and shows up differently in everyone.''

''Pre-eclampsia generally won't improve – the only cure is delivery.''

''I was admitted at 31 weeks with pre-eclampsia and monitored very closely until 34 weeks when they decided that the risk of delivery was less than the risk to my health.''

''I had high blood pressure, protein in my urine and swelling. At 38 weeks they admitted me and monitored every drop of my urine for 24 hours.''