What would cause 10 lb gain in 3 days, not water fat or muscle?

My scale is a fancy one that measures body fat (you stand on it barefoot). Suddenly (as in one weigh) it says I weigh 10 pounds more and have 6 percent higher body fat.. higher than ever. 10 pounds higher than THREE DAYS ago. I feel no different, look no different, and I don't do excessive muscle exercise (and it would have come off by now) What would cause sudden change in weight? (Also I tried it on another scale and it looks like I am heavier on that one too) My scale is digital (Someone asked these in an answer, in case someone else needs this info) It was the last day of my period (and today it is still just as high) I have been taking birth control for about 4 years now and I have been 20 pounds lighter while taking the same stuff

Public Comments

1. Are you about to get your period? If you are, then it is almost definitely water weight. That will also increase your body fat percentage. Also, things like birth control can cause an increase in weight and body fat percentage.
2. Hi, Your problem could be a few things, but through experience with my cients the most common is the condition of the way in. weighing yourself 3 days after your last is too soon number one, you should aim to weigh yourself once a month or fortnightly if you MUST. the body goes through a lot of changes in short periods and this can make a huge difference when you step on a scale, even tho you feel the same or not does not change the fact that inside your body is working, so make sure you weigh yourself in the identical scenario each month (eg. morning after you have been to the toilet wearing same clothes) this way it is fair and accurate. never weigh yourself after a workout or meal or after a big night out as this will through the numbers way off thr true figures. I wouldnt worry too much if you havent changed anything in your routine then you'll find that all will be fine. the other thing which you cant do anything about is the callobration of your digital scale, this could be off as well which is then a technical issue.. hope that helps somewhat