Neck & Shoulder Pain / Stiff Neck is a common condition that causes pain, tightness, or reduced movement in the neck and shoulder region. It can result from poor posture, muscle strain, injury, prolonged desk work, stress, or underlying conditions affecting the joints, discs, or nerves. Symptoms may include aching, stiffness, muscle tightness, headaches, and difficulty turning the head or lifting the arm. Treatment depends on the underlying cause and severity of the condition.