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.
Lymphedema is another cause of leg or foot swelling. It is caused by damage to the lymphatic immune system. The immune system is a network of small spider-web sized channels that carry a water consistency fluid. This watery fluid, called lymph, contains many types of immune system cells.