While submental fat (aka neck fat or double chin) is perfectly normal due to natural weight fluctuations, genetics, and loss of elasticity of the skin as we age, if this region has been a pain ...

But when you have pain under your left breast ... and may spread to your shoulders, arms, neck, jaw, or back, the NHLBI says. “Angina is concerning,” Dr. Ni says. “It can indicate a scenario ...

The spinal accessory nerve runs under the sternocleidomastoid ... a condition affecting the jaw joint, can also cause SCM ...