Today I have a painful stiff neck and can't turn to the left. Any advice?

What is cause? A painful stiff neck is often the result of simple wear and tear. The inability to turn can be the result of muscle spasm (most often), disc disease, arthritis, stress, flu like illnesses and heart problems if associated with chest pain. Treatment depends on cause. The right pillow for sleep is a must. Moist heat, yoga, stretching for mild symptoms. Physical therapy if not improving. See your dr.