Have a vibrating feeling off and on in right breast. feels like a nerve. am close to having a period but never had this feeling before. ?

More info please: Your sensations do not appear to represent a health risk. You may want to discuss it with your primary clinician, however, if you continue to have concerns or questions. Hope that helps.

Stress?: A vibrating feeling in a breast is not likely to be a symptom of breast disease. It may be due to muscle spasms(twitches)of the chest wall muscles. Sometimes stress or anxiety can cause us to focus on a transient bodily symptoms that would normally not worry us or get our attention. However if the symptoms continue you should see your physician.

Internal thoracic n.: This is an interesting question. What could be causing a feeling of vibrating in the right breast? The mammary nerve (called the Internal thoracic Nerve) runs along the Internal Thoracic Artery as it drops into the breast. It's formed from the Phrenic nerve which connects to the diaphragm and subclavian plexus. The vibration may be some type of odd stimulation of that nerve in its course.