A 61-year-old woman presented with progressive swelling of both feet and increasing fatigue. Because she was older and mildly breathless on exertion, heart failure was considered early.
However, there was no orthopnea, no raised JVP and the lungs were clear. Cardiac evaluation did not explain the degree of edema.
The clue outside the cardiovascular system
She also reported constipation, dry skin, slowing of daily activities and increasing intolerance to cold.
Thyroid testing showed significant hypothyroidism.
The diagnostic twist
Edema has a broad differential: cardiac, renal, hepatic, venous, lymphatic, endocrine and medication-related causes. The most familiar explanation is not always the correct one.
Clinical pearls
- Characterize edema before labeling it.
- Examine JVP, lungs, liver, urine findings and medication history.
- Look for systemic clues such as cold intolerance, skin changes and bowel symptoms.
- Treating the cause is more important than reflexively prescribing a diuretic.
Take-home message
Swollen legs are a syndrome. The diagnosis begins after you notice the edema—not when you name it.
Educational note: This is a fictionalized/composite teaching case created for clinical reasoning. It is not a record of an identifiable patient and is not a substitute for local protocols, specialist advice or patient-specific clinical judgement.