Just give me two slices of Pizza and you will find my legs swollen by morning. It is too much salt, in my case. I rarely use salt or use any foods that are heavy in it.
Like a store bought can of soup. Wow! But forbidden food does taste the best, doesn't it.
If I sit too long at the computer, and don't move around, the swelling will stay there. I must move, walk, stretch or do some sort of exercise to get the blood moving or I think it will normally pool at it's lowest level for me.
If I move around and drink plenty of water to flush out the salt, it disappears by the next day. It is uncomfortable and the skin feels so tight. I hate when this happens.
Some meds can cause this too, or illnesses. So if it is new, call the doctor, you know the drill BN. I hope you can get it to go away. Good luck to you.