How did i get a stiff neck what could i do for it?

Many reasons : From just sleeping the wrong way to stress or prolonged positioning or an awkward one to overuse of the muscles with some activity to name a few. Treatment can be otc medication, heat applications and stretching while in a hot shower to avoiding activities that may aggravate your symptoms . If a smoker stop and if a couch potato, consider regular exercise. Massage may help as well.