Hi, <strongCustomer You should consult a doctor to evaluate your symptoms .
What you are feeling could be related to certain conditions like :
upper slipped back vertebral disk ( when one disk slips over the other ,the nerves that travel between these disks become compressed , producing these sensations )
Diabetes (elevated blood glucose levels produced by an hormonal deficiency of insulin )
altered electrolyte blood levels
herpes zoster ( a viral infection that can produce this tingling left nipple sensation ).
Your doctor will need performing some tests including : an upper spine MRI, nerve conduction studies , electrolyte blood tests and glucose blood test .
With these test results , your doctor will be able to determine the specific cause of your symptoms to give you the appropriate treatment .
If you like the answer, please click accept . A bonus will always be sincerely appreciated .