Costochondritis usually has no apparent cause. Treatment focuses on easing your pain while you wait for the condition to improve on its own, which can take several weeks or longer. Costochondritis usually goes away on its own, although it might last for several weeks or longer. Treatment focuses on pain relief. Over-the-counter nonsteroidal anti-inflammatory drugs pain relievers. Heat or ice. Try placing hot compresses or a heating pad on the painful area several times a day. Keep the heat on a low setting. Ice also might be helpful. Rest. Avoid activities that make your pain worse. Physical therapy treatments might include: Stretching exercises. Gentle stretching exercises for the chest muscles may be helpful. Nerve stimulation. In a procedure called transcutaneous electrical nerve stimulation (TENS), a device sends a weak electrical current via adhesive patches on the skin near the area of pain. The current might interrupt or mask pain signals, preventing them from reaching your brain. Consult orthopedician...

the site of pain is not clear is it the vertebrae or the sternum. please consult Ortho surgeon and get relevant investigations done for proper treatment