Edema in Pregnancy: Why It Occurs and When It Is Dangerous

In the evening you take off your shoes and realize your toes have become wider and your ankles pit softly when pressed. Almost every pregnant woman knows this. Let us calmly sort out where normal ends and a reason for concern begins.

Why edema occurs in pregnancy

A pregnant woman's body retains more water than usual. Over the day, excess fluid collects in the lowest areas — in the legs, feet, and ankles, especially in hot weather or if you have been standing for a long time. The growing uterus presses on the pelvic vessels, blood flow in the legs slows, and fluid is retained in the tissues. Edema is simply an accumulation of fluid in the body's tissues, and pregnancy is on the list of its causes alongside excess salt, heart, kidney, and liver disease, and the use of certain medications. The conclusion is simple: edema in itself is not a diagnosis; what matters is its character.

Leg edema in pregnancy: what is considered normal

Moderate edema that gradually descends to the legs is a variant of normal. It usually increases toward the end of the day and toward the end of pregnancy, does not harm you or the baby, although it can be uncomfortable. Such edema occurs in 50–80% of pregnant women with a physiologically proceeding pregnancy. Conclusion: smooth evening edema is not a disease.

Which signs of edema should raise concern

What is concerning is not edema as such, but its suddenness and spread. The following should raise concern:

• a sharp increase in edema of the face, hands, or feet;
• weight gain of 500 g or more per week;
• night trips to the toilet and a decrease in urine volume.

Obvious edema is distinguished by degree — from the limbs to the abdominal wall and face. Conclusion: what matters is the dynamics, not the fact of swelling itself.

The link between edema, blood pressure, and preeclampsia

Preeclampsia is a condition of the second half of pregnancy with elevated blood pressure and protein in the urine, often with edema. Persistent edema is considered its early symptom, whereas moderate evening edema is not. Diagnostic criteria: blood pressure above 140/90 on two measurements 4 hours apart and protein in a 24-hour urine sample above 0.3 g/L. Severe signs are blood pressure above 160/110, grade III–IV edema, and low urine output. Conclusion: edema combined with blood pressure changes the whole picture.

What examinations are prescribed for edema

The doctor assesses blood pressure, weight gain, and the character of the edema and prescribes urine tests, including a 24-hour protein test, and other laboratory investigations as decided by the doctor. If preeclampsia is suspected, risk factors are taken into account — preeclampsia in the past, kidney disease, diabetes, multiple pregnancy, age under 20 or over 35, obesity. Conclusion: examinations are chosen by the doctor, not the internet.

Edema in itself is not a reason to call an ambulance; 103 or 112 — if there is a sharp increase in edema of the face, hands, or feet, very severe headache, visual impairment, pain under the ribs, persistent heartburn, nausea and vomiting, or marked malaise.

When edema requires urgent medical attention

With the signs listed above, you must immediately contact the doctor managing your pregnancy or the maternity ward. Delay in preeclampsia is dangerous: without monitoring and treatment it causes serious complications. Conclusion: alarming symptoms are discussed the same day, not "after the weekend."

This material is for reference and does not replace a doctor's consultation — if in doubt, call your doctor; that is what they are there for.

This content is for reference and does not replace a doctor's consultation. Medical disclaimer