Why Does My Left Foot Swell Im 21 Weeks Pregnant And My Left Foot Is Swollen. How Long Does It Take To Subside?

Im 21 weeks pregnant and my left foot is swollen. How long does it take to subside? - why does my left foot swell

This is the first time I've seen to remain swollen for so long. The several hours that I keep my feet and I drank plenty of water. My right leg was slightly swollen too, but that is now back to normal. How long does it take to give the swelling on the left side?