I have this problem since last year. I get the calf pain atleast once on two/three days. I was in to sports and stopped when I was almost 18. I started going to gym two years ago and couldn't continue for long but I try to do a little exercise when ever it is possible. I am not sure if this is because of weekness or something else. My BMI is absolutely fine and I am not overweight or fat. Is there any way that I can find out what is the cause of this?