I have what my doctor and myself assume is cyclical axillary pain related to my menstrual cycle (worse pain closer to menstruation). There is also a small lump that increases and decreases in size. I had a clear mammogram two months ago, just prior to last gyno appt. This month, the pain is causing radiating pain down my arm from axilla to palmar forearm and up into anterior neck (SCM, anterior fibers of upper trap). I would describe as a nerve pain, aching.