I sprained my knee last month (dec22) and it took two weeks but it got better, but now whenever i bend my knees it starts to hurt? It started to hurt no less than a week maybe 10 days ago. It doesn't hurt when i walk or when i sleep just whenever i apply some slight pressure it hurts, But sometimes at night i hear my knees crack or something? Should i see a doctor for this or will time heal it? My dad said it's because i don't exorcise enough but i dance And i don't think i have arthritis because im only thirteen