I am 19 female. And since highschool I've been having episodes of my feet swelling up and being bright red and hot. Its not constant. What could it be?

See answer . In general, leg and feet swelling often related to excessive salt intake and being on one's feet for a long time. Certain medications, such as hormones like estrogen and steroids, as well as drug abuse can also cause this condition. Other causes include heart, kidney, and liver disease; lymphatic obstruction; venous problems; and infections all of which are unlikely in an otherwise healthy 19 y/o.