I have pain in my neck during my period. I am 36 yrs old and an Osteopath, so thought about it and there are a few factors. Hormones around period time aggravate inflammatory pain, hormones altering tension in muscles and ligaments, pelvic congestion aggravating lymphatic congestion. Another possibility is diaphragmatic endometriosis
referring pain to the neck...I have felt like I have had endo since my 2nd c-section.