The median IL-6 serum concentrations was found to be 6.5 [6.4 – 8.6]pg/ml in women with endometriosis who reported mild pain, 7.1 [6.1 – 11.3]pg/ml in those who reported moderate pain, and 7.1 [5.7 – 9.3]pg/ml in those who had severe pain. Here, IL6 is linked to endometriosis.