My grandmother had difficulty walking because her feet were very swollen, likely due to poor circulation.

If the swelling was severe enough to make walking difficult, it would generally warrant medical evaluation, especially if it developed suddenly, was accompanied by pain, redness, shortness of breath, chest pain, or swelling in only one

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If you’re talking about a specific situation involving your grandmother, I can help you think through the possible causes if you tell me:

Her age
Whether both feet were swollen or just one
How long the swelling had been present
Any known medical conditions (heart, kidney, diabetes, etc.)
Whether she had other symptoms such as shortness of breath, pain, or skin changes

Thank you 😊