[Diagram showing areas of pain referred from the scalene muscle group. This diagram shows the possible involvement of scalenes in chest pain, upper back pain, jaw pain, face pain, headache, arm pain and hand pain.]

[Diagram showing areas of pain referred from the scalene muscle group. This diagram shows the possible involvement of scalenes in chest pain, upper back pain, jaw pain, face pain, headache, arm pain and hand pain.]

Original article and pictures take https://saveyourself.ca site