My ankles swell everyday n my legs feel tired n heavy ive done a thyroid test n came back fine according to my doc..what cud b da cause of this?

Vein malfunction: Often this has to do with our veins not working as well as they once did to bring fluid back from our legs to our heart and lungs. Keep salt <2g/day, drink 64oz water/day, plenty of protein in your diet, exercise, try compression stockings and elevate when resting above your heart. If that doesn’t help, or if you are noticing a decrease in urination, abdominal pain, diff. Breathing, be seen.