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.
Diseases such as gout, diabetes, tendonitis, and arthritis also lead to top-of-foot pain. Occasionally the nerves become traumatized when pressure is applied to them. A tight pair of shoes can cause pressure. Hormonal imbalances, such as occur during pregnancy or menopause, can also cause the top of the foot to ache.