How can I manage edema?

Find the reason. Edema or swelling must have a cause. Understanding that cause and treating it will reduce the edema. Of importance is: where is the swelling, are there any food or medicinal allergies, bug bites, trauma etc? An md consult is warranted to diagnose the reason. If it is minor, so will the treatment be. If it is major and an important anatomic area, a short course of cortico-steroids may be used. Md!
Elevate and move. Leg swelling is very common in pregnancy. It can be helped with several things. Elevate your legs whenever possible. Stay well hydrated. Eat healthy. Stretch your legs frequently. Wear comfortable shoes and socks. Some people like the maternity support stockings.