What is the cause of prolonged tingling sensation and numbness in your upper left shoulder?

Answer:

Sounds like an inflamed nerve in your upper back... A branch of the long thoracic nerve located is at the upper (& inner) edge of your shoulder blade (scapula). Have someone press in that area and see if it reproduces the symptoms. Id so, a lidocaine/steroid injection can solve the problem... An orthopedic doctor or neurologist can treat this (or a really good Family Practice doc)...

First answer by Gyoderpa. Last edit by Gyoderpa. Contributor trust: 231 [recommend contributor recommended]. Question popularity: 3 [recommend question].