Swelling caused by excess fluid trapped in body tissues, most commonly seen in the legs, ankles, and feet. Can result from heart failure, kidney disease, or local inflammation.
From Greek 'oidema' meaning 'a swelling,' from 'oidein' (to swell). The term has been used in medicine since ancient times, with Hippocrates describing various forms of swelling. The word entered English through Latin in the 14th century and has remained the standard medical term.
Edema follows gravity like water finding its level! That's why it typically appears in your feet and ankles when you're upright, but shifts to your back and face when you're lying down for long periods.
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