The Common Vein Copyright 2010
Definition
Oligomenorrhea is a term used for infrequent menstrual bleeding. The menses may be regular at long intervals or irregular.
There are many causes of oligomenorrhea, but the most common are chronic anovulation and polycystic ovarian syndrome (PCOS).
The result is menstrual bleeds occurring >35 days apart.
Structural and functional changes vary depending on the cause.
Women present clinically with infrequent menses. Women early in pregnancy may present with oligomenorrhea after they begin missing menstrual periods.
Diagnosis is based on clinical history and treatment is based on the cause found at evaluation.