Muscle spasms in the upper chest when turning your head could be related to muscle strain or nerve irritation in the neck or upper back area. This might involve muscles that connect the neck and chest, which can tighten or spasm with certain movements.

• Such spasms can result from poor posture, muscle overuse, or minor injury.
• If the spasms are painful or persistent, a muscle relaxant like Myoril (containing thiocolchicoside) is sometimes prescribed to relieve stiffness and improve movement.
• Avoid sudden or extreme neck movements and consider gentle stretching or applying heat to the area.

If the spasms worsen, are accompanied by numbness, weakness, or chest pain, or do not improve with basic care, please consult a neurologist or orthopedic specialist for a thorough evaluation and tailored treatment. If you want, I can explain how muscle relaxants like Myoril work or suggest specific exercises.To narrow down potential causes, we will need some more information.Please tell me your age and gender.