What Causes Swelling On Feet And Ankles With Slight Tingling Feeling?

HI,I HAVE A CONCERN ABOUT MY FEET,I WOKE UP THIS MORNING AND BOTH OF MY FEET AND ANKELS WERE SWOLLEN THEY LOOK LIKE KANKELS BUT I AM NOT OVER WEIGHT.THEY DO NOT HURT BUT DO HAVE A SLIGHT TINGLING FEEL IN THE LEFT FOOT DOES NOT HURT TO WALK BUT AM CONCERNED WHY THEY ARE SWOLLEN I DO NOT STAND ON MY FEET ALL DAY AND WEAR FLIP-FLOPS MOST OF THE TIME.WHAT COULD BE THE CAUSE OF MY SUDDEN SWOLLEN FEET/I AM 49 YEARS OLD AND A FEMALE IF THAT HELPS.I HAVE NEVER HAD THIS TO HAPPEN BEFORE AND AM GETTING A LITTLE WORRIED,MY UNCLE AND LATE HUSBAND PASSED AWAY WITH LIVER CANCER AND THEIR FEET USED TO SWEEL LIKE MINE ARE NOW