Symptoms most often start late in the childbearing years after having children. Adenomyosis can cause menstrual cramps, lower abdominal pressure, and bloating before menstrual periods and can result in heavy periods. Because the symptoms are so similar, adenomyosis is often misdiagnosed as uterine fibroids. Earlier, the only definitive way to diagnose adenomyosis was to perform a hysterectomy and examine the uterine tissue under a microscope.
According to a published study in Mexico, Adenomyosis was reported in 140 out of 794 patients,, i.e.17.6%. The prevalence of adenomyosis among patients with endometriosis was 40.7% (11/27), and among those without this diagnosis, 16.8% (129/767).