4 Menstrual-Cup Claims to Check Against the Evidence

Before choosing a cup, separate the sales claims from the study findings.

Four claims to examine

1. “Cups leak more than pads or tampons.” Four direct-comparison studies in the review found similar or lower leakage with cups. That finding doesn’t mean every cup fits every user or prevents every leak.¹

2. “You’ll know after one try.” Qualitative studies described a learning period across several menstrual cycles. Early awkwardness alone doesn’t tell you whether a cup will suit you.¹

3. “A cup can’t cause a serious problem.” The review identified reports of pain, vaginal wounds, urinary problems and toxic shock syndrome. Such reports cannot establish how often these events occur, but they rule out a zero-risk promise.¹

4. “An IUD makes no difference.” A 2023 review found a possible association between cup use and IUD expulsion, with scarce and conflicting evidence. A later analysis of a copper-IUD trial found that expulsion findings differed by device; accidental self-removal was more frequent among cup users with both devices studied. Ask your clinician about your IUD and cup removal before combining them.²³

What the IUD study can and cannot answer

Participants were randomized to IUD types, not to menstrual-cup use. Cup use was examined in a secondary analysis. Results from two copper devices cannot settle risk for every hormonal or copper IUD.³

Keep product instructions and questions about your own circumstances together. If a product claim sounds absolute, ask which outcome the research measured and which users it included.

Period, Handled lists a Period Scorecard and Pack It planner in its toolkit. Those pages can help you record flow and organize period supplies alongside your product decisions. See the book.