Sodium is known to raise blood pressure (and sometimes greatly), so doctors generally recommend limiting it. Check with your healthcare professional before you up your intake -- if you consume an amount that's not good for you, it can lead to heart failure (especially if you're older).
Other possible causes for foot, leg, and ankle swelling include certain medical conditions or body changes, such as: Natural hormonal changes: Fluctuating levels of estrogen and progesterone can cause reduced circulation in the legs, resulting in swelling.
There are other causes of foot swelling -- such as blood clots. This often causes swelling more in the calf than the foot. In addition, heart problems, kidney problems and liver problems can all be serious causes of foot swelling -- but this most often causes swelling in both feet. Talk to your doctor. This should be evaluated to ensure there is not significant problem. Good luck!