Why does my leg have this pain? It s in my left upper thigh. When I sit, stand, bend over, or lift my leg a certain way, this causes the pain. It s an aching pain, like sore muscles after working out, but it s more severe and causes me to grimace a lot, and sometimes cry. It s been hurting for over a month but I don t want to see a doctor. Also, it was hurting BEFORE I started my gym class, so it wasn t injured in gym. Before gym, I didn t exercise and I m not sure what could have caused this. Could you tell me what it could possibly be? I m a 14 year old year, if that matters.