I have a pain in my neck on the right side that's been there for a month. when i turn my head it hurts?

Likely muscle injury: Muscular pain is the most common cause of neck/back pain. This can occur with mild or minimal trauma. It is also usually self limited and healing can be accelerated by stretching and exercise. Disc herniations and arthritis are other possibilities. If is does not improve in the next week or so, i would recommend evaluation by a physician.