What's the common cause of scoliosis?

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I'm 23 years old. Honestly, I'm not quite aware about those bone diseases but I am more concern because of what I'm experiencing right now. I never had an accident before and I also think I'm living a healthy lifestyle but still, I feel like I'm having a bad day whenever I wake up in the morning. My back is hurting me all the time. Can someone help me and tell me why? (I know I better need a check-up for this, but you know, not all peole wants to see a doctor...you say so!)