I am 21 years old and I have had leg pains all my life. It's hereditary, my mom had it and her dad had it. It is in my knee and stays there but the pain spreads up or down my leg. Sometimes it's just one leg sometimes it can be both at the same time. It feels like a constant ache/pain. When I was little it was so bad it would make me cry. It also tends to come at night. The only thing that helps it is heat and Advil. I've talked to my doctor many times about it and he had no clue what it could be. He told me to try staying hydrated but that doesn't seem to stop it from coming. It use to come maybe twice a month but now I am getting it maybe twice a week. You're help is extremely appreciated!!!