Actor Chhavi Mittal’s Tamoxifen story: Can the breast cancer drug cause fibroids?

Actor Chhavi Mittal recently disclosed that she developed a uterine fibroid while using the breast cancer drug tamoxifen, prompting discussions about whether the medication can cause fibroids. Oncologist Dr Smit Sheth clarified that while tamoxifen can indeed lead to uterine alterations, including fibroids, it is not accurate to state that the drug definitively causes them in every woman.

Tamoxifen works by blocking estrogen's effects on breast tissue, but it can behave differently in other parts of the body, such as the uterus. The drug's estrogen-like impact on the uterine lining can cause it to thicken, potentially leading to problems like unusual vaginal bleeding, which is usually not cancerous but warrants doctor's attention if it becomes new or irregular, especially after menopause.

While there are reports of fibroid growth in women taking tamoxifen, attributing a specific fibroid to the drug is challenging. Fibroids are common and influenced by various factors, including hormones and age. The distinction between "caused" and "associated with" fibroids is crucial because fibroid development is multifactorial.

Some studies suggest a link between tamoxifen and increased fibroid volume, particularly in postmenopausal women, indicating an estrogen-like effect on uterine tissue. However, confirming this connection in individual cases remains complex. Most fibroids are benign and may not cause symptoms, but tamoxifen's impact on uterine tissue also raises concerns about abnormal endometrial changes.

Women taking tamoxifen should not stop the medication without consulting their doctor, as its benefits in reducing breast cancer recurrence often outweigh potential fibroid risks. Symptoms that warrant immediate medical evaluation include new or unusual vaginal bleeding, particularly in postmenopausal women.