I am a teenager ( girl ) still in the process of growth, I have big breasts and if I walk much or work too long sitting at a table really hurts the top of the back and have a burning sensation . Could you please help ?

First, large breasts require a good support system . Make sure you buy good quality bras that fit you well (this may require the request to be made ​​to measure). Physical therapy and proper exercise can help strengthen muscles, improve posture and maintain a healthy weight . Try taking any medications without prescription for back pain . Finally , a future option would be performed a breast reduction , but not while they are still growing.