There is a normal curvature of the cervical spine
which is maintained by the shape of the bones, the ligaments and the muscles of neck. Whenever there is a problem with any of these structures then the curvature can change. The usual cause of it is muscle spasm. The muscle spasm is usually associated with pain. The treatment involves analgesics and the muscle relaxant
medications. Along with that physical exercises and other therapies like hot fomentation as advised by physiotherapist are useful.