I drank coffee strong and in plentiful quantity until after 30 years my feet started swelling up, equilateral edema. I cut the caffeine using decaf and the quantity, presto! No more cramps or edema.
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I googled it. That looks bloody nasty. I didn't have any swelling just the cramps.
Admittedly it had me concerned. The only explanation I can offer is that after so many years of soaking in caffeine my body just said enough is enough. The inflammation started in the furthest bodily extremity with the lowest blood circulation. I suspect bad things could have happened if I hadn’t figured out the cause.