Edema in pregnancy
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ACOG swelling edema pregnancy warning signs preeclampsia
Mild swelling of both feet and ankles is common in pregnancy, especially in the third trimester and later in the day. It happens because the growing uterus slows venous return from the legs and pregnancy promotes fluid retention. The medical library notes that peripheral edema is common in normal pregnancy, but can be hard to distinguish from early preeclampsia.
Usually reassuring
- Gradual, symmetric swelling of both ankles/feet
- Worse after standing or hot weather
- Improves with rest, lying on the left side, or elevating the legs
Contact your maternity clinician urgently today if swelling is sudden, severe, or involves the face, around the eyes, or hands, particularly with:
- Persistent severe headache
- Blurred vision, flashing lights, or spots
- Pain beneath the right ribs or upper abdomen
- Sudden weight gain, nausea/vomiting later in pregnancy
- Blood pressure at home of 140/90 mmHg or higher
These can be signs of preeclampsia, which involves high blood pressure and possible organ involvement. ACOG lists these warning symptoms.
Go to emergency care now for:
- One leg that is newly much more swollen, painful, red, or warm, which may suggest a deep-vein thrombosis
- Shortness of breath, chest pain, fainting, coughing blood, or swelling plus breathing difficulty
- Severe headache or visual changes
Helpful measures for uncomplicated ankle swelling:
- Rest with feet elevated and avoid prolonged sitting or standing
- Lie on your left side when resting
- Walk regularly and do ankle-calf movements
- Wear comfortable shoes; consider clinician-approved compression stockings
- Maintain normal hydration
- Do not start diuretics or restrict fluids/salt aggressively unless your obstetric clinician specifically advises it
Edema alone does not diagnose preeclampsia, but new swelling with the warning symptoms above needs assessment. Recent systematic-review searching did not identify evidence that changes this safety-focused guidance.
Grade of pedal edema
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pitting edema assessment
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pitting pedal edema grading 1+ 2+ 3+ 4+ clinical examination
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Pitting pedal edema grading
Press firmly with a thumb over the dorsum of the foot, behind the medial malleolus, or over the shin for about 5 seconds. Grade by the depth of the pit and time for skin to rebound.
| Grade | Finding |
|---|---|
| 0 | No pitting edema |
| 1+ | Mild: ~2 mm pit; disappears immediately |
| 2+ | Moderate: ~4 mm pit; rebounds in less than 15 seconds |
| 3+ | Marked: ~6 mm deep pit; obvious swelling; rebounds in up to 30 seconds |
| 4+ | Severe: ~8 mm or deeper pit; gross swelling/distortion; persists more than 30 seconds |
Pitting edema is a temporary indentation after firm pressure, conventionally reported from 1+ to 4+. - Frameworks for Internal Medicine, p. 305
Example documentation: “Bilateral pedal pitting edema, 2+, extending to the ankles.”
In pregnancy, note whether it is bilateral or unilateral. Sudden facial/hand swelling, severe headache, visual symptoms, high BP, or one-sided painful swollen leg needs prompt assessment.
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