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.
Neuropathy can cause swelling in the following way. If you don't move your foot, as in walking, or flexing it up and down, then the blood circulation becomes stagnant. It does this because our feet and legs depend on the contraction of the muscles to squeeze the veins and help the blood flow back up to the heart.