Gaz lacrymogènes : des milliers de femmes témoignent de troubles menstruels après les manifestations

The intersection of public protests, law enforcement tactics, and women’s health has emerged as a contentious focal point in France and internationally. In the wake of recent social demonstrations, thousands of women have come forward with alarming testimonies detailing severe menstrual irregularities, abnormal bleeding, and intense uterine cramps following exposure to tear gas. While affected individuals and reproductive justice advocates demand immediate investigations and institutional accountability, medical professionals and toxicologists remain divided, citing a severe lack of empirical data and pointing toward alternative variables such as acute psychological stress. This growing controversy has exposed a significant blind spot in occupational and public health research regarding the long-term systemic impacts of chemical crowd-control agents on female reproductive biology.

The genesis of this public health debate can be traced through a specific chronology of social unrest and grassroots mobilization. On October 17, a day marked by widespread social mobilizations and labor strikes across France, violent clashes erupted in the margins of several official processions. In Paris, particularly around the Place de la République, the chaos of the streets breached domestic boundaries. Tear gas deployed by security forces drifted upward, infiltrating residential apartments. Among those affected was Amina, a 39-year-old technology executive whose home overlooks the square. Within hours of the exposure, she experienced acute physical symptoms, including severe migraines and persistent nausea. Two days later, she suffered from debilitating menstrual cramps that she described as mirroring the intensity of childbirth contractions. According to Amina, such agonizing pain was entirely unprecedented for her, persisting continuously for several days and disrupting her professional and personal life.

Amina’s experience is far from isolated. Recognizing a widespread pattern of similar complaints, activists established a collective named “Lacrymos de sang” (Bloody Tear Gas) on October 8. The primary objective of the initiative is to raise awareness regarding the potential health hazards associated with tear gas exposure during menstruation. Through an extensive online questionnaire distributed across social media platforms, the collective has amassed more than 8,000 testimonies from women reporting similar gynecological anomalies. Eva-Luna Tholance, a reproductive justice activist and founder of the collective, highlights that respondents frequently detail excruciating uterine and ovarian pain alongside unpredictable and heavy bleeding. Tholance emphasizes that the primary goal is to compel public health institutions and the scientific community to address what she describes as a profound scientific void surrounding the physiological impact of chemical agents on the female body.

To understand the biological plausibility of these claims, experts examine the chemical composition of the primary deterrent used by French law enforcement agencies: 2-chlorobenzylidene malononitrile, commonly known as CS gas. CS gas is an aerosolized compound designed to cause immediate sensory irritation, specifically targeting the eyes, upper respiratory tract, skin, and mucous membranes. Under normal physiological circumstances, these acute irritant effects are transient, typically subsiding within minutes to a couple of hours following fresh-air exposure and decontamination. However, toxicological research conducted in various international contexts over the past decade has increasingly pointed toward potential systemic consequences that extend far beyond localized sensory irritation.

Historical data and prior public health crises offer parallel insights into the gynecological repercussions of tear gas. In the United States, parallel surveys conducted among individuals exposed to chemical irritants during the widespread Black Lives Matter protests of 2020 revealed that more than half—and in some demographic subsets, up to two-thirds—of female respondents experienced notable menstrual irregularities in the weeks following exposure. Similar anecdotal and preliminary clinical observations have emerged from nations marked by intense civil unrest, such as Chile and Bahrain. Despite these troubling correlations, the scientific validity of these findings has historically faced skepticism due to methodological limitations. The vast majority of existing data relies on retrospective, self-reported surveys from anonymous or self-selected cohorts, making it exceptionally difficult to establish a definitive, direct causal link between chemical exposure and subsequent endocrine or uterine disruption.

Addressing the biochemical pathway, Alexander Samuel, a French molecular biologist and educator, has spent considerable effort investigating the metabolic breakdown of CS gas following incidents such as the extensive "Gilets Jaunes" (Yellow Vests) protests. According to Samuel’s theoretical framework, when CS gas enters the human body, its metabolic degradation can yield cyanide compounds. These metabolites possess the theoretical capacity to induce cellular effects comparable to mild hypoxia, or oxygen deprivation. Samuel hypothesizes that this systemic cellular stress could theoretically interfere with the delicate hormonal signaling pathways that regulate the human menstrual cycle. Nevertheless, he maintains that this remains strictly a working hypothesis requiring rigorous empirical verification, urging governmental authorities to establish dedicated monitoring structures to track the systematic health impacts of CS gas and generate transparent, peer-reviewed data.

The scarcity of concrete data is further compounded by a lack of corporate transparency. An independent investigative report published by the medical journal Prescrire in October 2025 underscored that the long-term health consequences of CS gas exposure remain poorly understood, largely hindered by a systemic deficit of independent studies and the closely guarded proprietary formulas maintained by chemical manufacturers. When journalists and advocacy groups approached the Directorate-General for Health (DGS) in France regarding the burgeoning wave of testimonies linking tear gas to gynecological distress, the agency declined to provide an official comment, further frustrating advocates who view governmental silence as institutional neglect.

Conversely, a substantial segment of the medical establishment urges caution against drawing premature conclusions, pointing instead to the complex, multifactorial nature of protest environments. Isabelle Derrendinger, president of the National Council of the Order of Midwives, argues that the severe physical symptoms reported by women can be plausibly attributed to the intensely anxiogenic and chaotic environment of modern demonstrations. It is well-documented in clinical endocrinology that acute anxiety, psychological trauma, and elevated stress levels exert a profound influence on the hypothalamic-pituitary-ovarian axis, which governs the menstrual cycle.

This perspective is echoed by Dr. Jérôme Langrand, director of the Paris Poison Control Center. Dr. Langrand characterizes the attribution of menstrual disorders directly to tear gas as an oversimplified logical shortcut. In his professional assessment, physiological disruptions of the menstrual cycle are entirely expected outcomes when individuals are thrust into high-stress, physically demanding, and emotionally volatile scenarios such as street protests. From this viewpoint, the primary catalyst for the reported symptoms is the psychological burden and adrenaline surge of the event, rather than the biochemical toxicity of the CS gas itself.

However, this dismissal of chemical toxicity in favor of psychological explanations has drawn sharp criticism from frontline healthcare workers. Sophia Rakrouki, a practicing midwife and author of Le grand guide de la fertilité, acknowledges that while acute stress acts as a significant physiological risk factor, it does not automatically account for every case nor does it establish a uniform rule. Rakrouki expresses frustration regarding a recurring medical tendency to pathologize female complaints by defaulting to stress as a catch-all explanation, a phenomenon she argues disproportionately minimizes women’s pain. She advocates for an approach that refuses to sweep these testimonies under the rug, insisting that the sheer volume of corroborating reports mandates serious, dedicated scientific inquiry because female patients deserve rigorous medical investigation rather than generalized dismissals.

The societal and political ramifications of this debate quickly transcended the medical sphere and entered the legislative arena. On October 22, French Member of Parliament Mathilde Hignet, representing the Left-wing party La France insoumise, took to social media to formally petition the government to institute a total ban on the use of tear gas during public demonstrations. Framing her demand around the foundational legal framework of the precautionary principle, Hignet argued that public health protection requires immediate preventative action rather than waiting for decades of academic research to definitively establish every potential toxicological harm. Her public appeal underscored a growing political sentiment that law enforcement tactics must be re-evaluated through a modern public health lens, particularly concerning demographic-specific vulnerabilities that have historically been overlooked in state security policies.

As the debate continues to unfold, the pressure on public health institutions, toxicologists, and lawmakers mounts. The juxtaposition of thousands of detailed personal testimonies against a backdrop of institutional silence and methodological skepticism highlights a critical vulnerability in the governance of public safety. Whether future independent research will definitively link the chemical constituents of CS gas to endocrine and uterine disruption remains to be seen. What is currently certain, however, is that the voices of thousands of women have successfully dragged an invisible, long-ignored occupational and public health hazard out of the shadows and into the center of contemporary political and medical discourse.