My doctor told me today to reduce my salt intake and watch what I eat! Too much salt causes it
Keep your feet up. Also those little foot baths are awesome with Epsom salt in them
Drink LOTS of liquids...mostly water! I was very swollen and uncomfortable and that was the #1 advice my Dr. gave me. If it's your feet that are swollen really bad I would also put them up for most of the day if possible...I lay on the couch with them on top of a pile of pillows! It helps keep the swelling down...good luck!