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.
Joint conditions can also cause itchy, swollen feet. Gout is particularly likely to cause swelling, first of a toe, and then later of larger portions of the feet. Itching typically comes later in the process, often toward the end of a bout of gout. Itchy and swollen feet may be caused by skin infections as well. A bacterial infection, either at the surface of the skin or at the site of a wound may cause itching and swelling. Fungal infections of the skin are common and can also cause these symptoms.