What are reasons for swollen ankles?

too much sodium, or water retention, also if you are on your feet for too long, or pregnancy.

See your doctor.Worst case...CHF At any rate, maybe you need a mild diuretic.

well if they are both swollen and you can press on the swelling and the pressure leaves a shape it's called oedema (bilateral) this can be related to taking too high a dose of beta blocker,so cardiac output is not sufficient to get blood back to heart at the correct moment,thus fluid develops in area. Making a shape in the swelling is not painful but heart failure must be ruled out,especially if you are sedentary and/or overweight. Being overweight is not a good thing for any Heart but i do respect all, thin, medium and big (for the record). If you find touching the swelling painful and it does not cause 'pitting' on pressing any part,this could be uric acid crystals ,a condition called gout.See your doc, let them take a look, very best wishes Rick

If they're the same size as normal then they're not swollen, they're just normal for you. If they're bigger than usual it could be caused by being in a plane too long, prengnancy, or a mild sprain.