 [ Symptoms ] why does birth control cause you to gain weight  i started birth control just 1 week ago and i have already gained 4 pounds my eating is the same and so is my exercise so why am i gaining all this weight is it water weight if i stop taking the pill can i easily lose the weight [ Disease ] hi your find it the hormones somehow you will need to adjust your diet and increase your exercise program its either a happy sex life by taken the pill or you will always be worried things are ok about his condoms and all the other problems concerning male sperm just give it a couple more weeks to see how you settle down with it you could try changing brands do hope this helps you good luck