Swollen feet or ankles — often dismissed as no big deal — can sometimes be your body’s way of raising a red flag. While occasional puffiness after long days or heat may be harmless, persistent or recurring swelling may indicate underlying problems. Understanding why feet swell, when it’s “nothing,” and when it’s serious can help you stay healthy and safe.
👣 What Is Swelling / Edema
Medically known as edema, swelling in the feet, ankles, or legs occurs when fluid builds up in the body’s tissues rather than being properly filtered out or circulated. Mayo Clinic+2MedlinePlus+2
Usually gravity — especially when we sit or stand too long — pulls fluid down toward our legs. That’s why lower limbs are often affected. nhs.uk+1
Often, this swelling is temporary and harmless. But other times, it’s a symptom of a more serious issue that deserves medical attention.
✅ Common & Often Harmless Causes of Swollen Feet
Before panic sets in, many of the causes of swollen feet are benign — and easily fixed. These include:
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Prolonged sitting or standing — Staying in one position for too long impairs circulation and fluid returns. nhs.uk+1
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High salt intake — Eating a lot of salty foods makes your body retain water, leading to puffiness in feet/ankles. British Heart Foundation+1
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Hot weather — Heat causes blood vessels to expand, allowing fluids to leak into surrounding tissues, which then gravitate downward. Medical News Today+1
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Pregnancy — Hormonal changes and increased pressure on leg veins can cause swelling. Mayo Clinic+1
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Simple injury, insect bites or minor infection — Sprains, bites or mild infections can cause localized swelling. MedlinePlus+1
In these cases, swelling often resolves on its own — especially if you rest, elevate your legs, reduce salt intake, and keep moving. Mount Sinai Health System+1
