galactorrhea galactorrhea (disease) ICD9:611.6 MONDO:0009256 SCTID:78622004 galactorrhea MESH:D005687 UMLS:C3665358 NCIT:C113343 galactorrhea (disease) HP:0100829 MEDGEN:777088 Excessive or inappropriate lactation in females or males, and not necessarily related to pregnancy. Galactorrhea can occur either unilaterally or bilaterally, and be profuse or sparse. Its most common cause is hyperprolactinemia. lactation disease