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Good exercise tolerance means –there is no heart failure
/ swelling may not relate to the heart
It is from fluid retention and a weight gain of 10 % is generally needed for it to become obvious...
Weakness of leg veins could be the cause – can be confirmed by Doppler study of leg veins...
See an Internist / get yourself examined / at times, basic investigatton may be necessary...
Wishing speedy recovery