Examining these classical principles through modern medicine provides clear physiological parallels. Adenomyosis occurs when endometrial tissue infiltrates the myometrium and undergoes proliferation. In a typical cycle, the endometrium thickens and sheds in response to hormonal shifts. In adenomyosis, however, endometrial tissue trapped deep within the myometrium proliferates and bleeds along with each cycle. Because this blood cannot drain externally and remains confined within the muscularis, it triggers chronic inflammation and edema in the surrounding smooth muscle, eventually leading to diffuse uterine hypertrophy and tissue firmness.
Several mechanisms drive this progression. First, hormonal imbalance is a central contributor. Estrogen stimulates growth of both the endometrium and the myometrium. Patients with adenomyosis often show heightened uterine sensitivity to estrogen or an altered estrogen-to-progesterone ratio leading to estrogen dominance, which further promotes the infiltration and proliferation of endometrial tissue within the muscular layer.
Second, a chronic inflammatory response and immune dysfunction play significant roles. Recurrent bleeding and tissue damage within the myometrium sustain an ongoing inflammatory reaction, elevating levels of inflammatory mediators such as prostaglandins. Prostaglandins intensify uterine contractions, worsening dysmenorrhea. Concurrently, altered immune surveillance may fail to recognize and clear misplaced endometrial tissue, permitting unchecked proliferation.
Third, localized neurological changes compound the pain. Around adenomyosis lesions, the density of pain-transmitting nerve fibers increases, and nerve endings frequently show abnormal proliferation. This change magnifies pain signals, often producing intractable pain that responds poorly to standard analgesics. As uterine hypertrophy advances alongside inflammation, the enlarged uterus can compress adjacent organs and irritate pelvic nerves, resulting in radiating lower back pain and deep pelvic heaviness.
Fourth, increased angiogenesis is a hallmark of adenomyosis. To sustain the proliferating tissue, new blood vessels form excessively, which contributes directly to heavy bleeding and menorrhagia. In this manner, multiple pathological factors alter the structure and function of the uterus, culminating in severe dysmenorrhea, menorrhagia, anemia, and daily physical distress. The traditional concepts of blood stasis and cold-dampness closely mirror these modern processes of hormonal imbalance, chronic inflammation, neurovascular proliferation, and angiogenesis.
