What Causes Uterine Enlargement?
Apr 22, 2022
Source: Cainiu Health
Dr. Wang Lianlian
Introduction
Causes of uterine hypertrophy:
- Uterine factors: Chronic incomplete uterine involution in multiparous women. In multiparous women, elastic fiber tissue within the myometrium proliferates among smooth muscle fibers and around blood vessels, leading to uterine hypertrophy.
- Inflammatory factors: Chronic inflammation induces uterine fibrosis. Prolonged inflammatory stimulation causes cervical hyperemia and edema, as well as hyperplasia of cervical glands and stroma, resulting in varying degrees of cervical hypertrophy.
Uterine hypertrophy primarily involves hyperplastic changes in the uterine tissue. Common etiologies include the following:
1. Uterine factors
Chronic uterine involution failure in multiparous women leads to hypertrophy. In such cases, elastic fiber tissue within the myometrium proliferates among smooth muscle fibers and around blood vessels, resulting in uterine enlargement. Additionally, ovarian dysfunction—particularly persistent estrogenic stimulation—may cause myometrial thickening. Clinically, patients with dysfunctional uterine bleeding, especially those with prolonged disease duration, commonly exhibit varying degrees of uterine enlargement.
2. Inflammatory factors
Chronic adnexitis, pelvic connective tissue inflammation, and chronic myometritis can induce collagen fiber proliferation within the myometrium, leading to uterine fibrosis. Moreover, long-standing chronic inflammation causes cervical congestion and edema, along with hyperplasia of cervical glands and stroma, resulting in varying degrees of cervical hypertrophy. Pelvic venous congestion may also trigger hyperplasia of uterine connective tissue, thereby contributing to uterine hypertrophy.
