Left arm pain with numbness of hand 1 month post breast augmentation.

Hi and welcome to our forum!
Swelling after surgery can migrate into the armpit (axilla) and may be responsible for your symptoms which have developed relatively late in the early postoperative period. I certainly would bring this to the attention of your surgeon ASAP as it will require evaluation to establish a diagnosis (as other less common causes must be excluded) and close followup until it resolves. 
Best wishes!

Hi and thanks for your question. What you are describing is not that unusual. For a period of weeks to months patients often experience issues with numbness or shooting sensations in the breasts and sometimes the hands or arms. Concern would exist if the numbness was constant and started at the onset of surgery. The most likely cause is from the implant moving a little after surgery and related to pressing on the nerves, relating to breast pain or numbness. Numness and tingling in the arms could be related to position of the arms during surgery but is most likely related to new sleeping position or bras and garment or athletic activity modifications. Your body should adapt and go back to normal. If the numbness worsens or becomes constant make sure you call your surgeon and have a follow up exam. Good luck!