Hi,
Have you checked your urine through urine analysis? - usually
protein in urine or other
kidney problems can cause swollen legs, feet and ankle.
Have you done any test for arthritis? - usually, during the
cold weather, especially, when raining, arthritis problems arise.
Have you suffered any trauma in the affected area (lower
limbs)?
Do you suffer from any
liver or heart disease? - At some point (stage), such problems would arise.
What kind of shoes do you wear? - Tight shoes can also cause such problems.
What kind of job do you do? - Jobs requiring no physical activity, only sitting for long time, can also cause such problems. If yes, you can use a low chair to put over your legs or can do some walking steps from time in time.
Hope it helped!