The following tips may help prevent swelling.

Do not sit with your feet hanging down for long periods of time. Elevate your feet whenever possible. If you are traveling, stop and walk around at least once each hour.
Limit the amount of salt in your diet.
Exercise regularly. Warm up and stretch before exercising.
Drink plenty of fluids, and keep your skin cool in hot environments.
Avoid repetitive motions, or take frequent breaks to rest a body area.
Take medications as instructed. If swelling occurs often, discuss with your health professional whether taking your medication at another time of day would decrease the swelling.
Do not smoke cigarettes or use other tobacco products. They increase circulation problems.
If you have a chronic medical condition or are pregnant, follow your health professional's instructions on how to prevent swelling and when to call to report your symptoms.