Esophageal cancer Lymphomas Liver cancer Breast cancer and other cancers that spread to the bones in the neck may also cause pain between the shoulder blades, sometimes without other symptoms.

Dark lines on your neck, especially ... insulin resistance or liver problems. Acanthosis Nigricans, a skin condition causing dark, velvety patches, can be linked to fatty liver disease.

Dr Berg says a fatty liver can become heavy and enlarged, leading to fullness under the right rib cage and shoulder pain. "A ...