The disparity in how traumatic brain injuries are diagnosed and managed across genders reveals a significant gap in public health infrastructure. While medical guidelines often aim for universality, the physiological and systemic realities of concussion suggest that a one-size-fits-all approach may leave women and girls underserved.
The Gender Gap in Neurological Research
A persistent imbalance in clinical research has historically shaped the understanding of brain trauma. Much of the current medical consensus is derived from data where male participants represent approximately 80 per cent of the cohort, while 40 per cent of studies exclude women entirely. Only 1 per cent of research focuses exclusively on female athletes. This lack of representative data means that gender-specific vulnerabilities are often omitted from official health protocols and from the design of sideline assessment tools.
“The lack of research about women and concussion is one big difference that we can easily change,” notes US neurologist Dr Beth McQuiston. This research vacuum extends to regulatory guidance; for example, recent grassroots sports guidelines issued by health ministries focusing on the core message of “if in doubt, sit them out” often fail to reference gender-specific risks, despite evidence that women are up to twice as likely to suffer concussion as men when playing the same sports under identical rules.
This sits uneasily with broader public health commitments on gender. The World Health Organization defines gender equality as a core determinant of health and as a precondition for achieving the Sustainable Development Goals, including those related to safety in sport and ageing populations. Against that backdrop, the absence of sex- and gender-responsive concussion standards looks less like an oversight and more like a structural blind spot in national health planning.
Biological Drivers of Increased Vulnerability
The heightened risk and prolonged recovery periods observed in women are rooted in a combination of anatomical and hormonal factors. These biological markers influence both the susceptibility to injury and the subsequent neurological response, and they challenge the assumption that data derived from male cohorts can be applied without adjustment.
| Factor | Biological Mechanism | Impact on Concussion |
|---|---|---|
| Muscular Support | Lower neck muscle mass compared to males. | Reduced stabilization of the head during impact. |
| Brain Architecture | Higher density of thinner neurons crossing the corpus callosum. | Differences in how the brain’s hemispheres communicate post-trauma. |
| Hormonal Flux | Fluctuations in progesterone during the menstrual cycle. | Increased vulnerability during the luteal phase. |
Regarding the impact of musculoskeletal differences, Dr McQuiston explains: “Women tend to have less muscular necks. So when an injury occurs, say whether it’s a car accident or if it’s on a pitch, there is less support here.” A weaker brace at the moment of impact means more force is transmitted to the brain, even when the collision itself looks unremarkable from the sidelines.
The internal architecture of the brain also plays a role. “Women have more neurons crossing the corpus callosum – a structure in the middle of the brain that connects the right and left hemispheres – and they are thinner.” Those structural differences may help explain why some women report a broader range of post-concussive symptoms, from cognitive fog to mood disturbance, and why recovery timelines can diverge from male norms.
Perhaps most complex is the role of endocrine health. “Given the same woman at a different time, exact same injury, there can be a different outcome, depending on whether progesterone levels are high or low. It is worse if it is in the luteal phase [ie after ovulation, approximately days 15-28 of a 28-day cycle], when the progesterone levels are high and then all of a sudden they drop abruptly.” This phenomenon is linked to the trauma’s effect on the pituitary gland. “That is very intriguing,” says McQuiston. “We’re looking at studies right now, [asking] can someone be on a certain type of oral contraception, or can they take a certain kind of medication, to attenuate that drop if they had a concussion?”
Biomarkers and the Shift Toward Objective Diagnosis
Traditional diagnosis of mild concussion relies heavily on subjective observation and patient interviews. While CAT scans are used for severe injuries, they are often ineffective for mild concussions. “That doesn’t mean you didn’t have a brain injury. It just means that you don’t have any blood in there or a fracture,” Dr McQuiston notes. For women whose symptoms are dismissed as anxiety, stress or “normal” fatigue, that diagnostic ambiguity can mean delayed care.
To solve this, new diagnostic technology is shifting toward blood-based biomarkers. By measuring two specific brain proteins-GFAP and UCH-L1-clinicians can objectively identify brain trauma, including in emergency departments that lack specialist neurology services. This process functions on a molecular level: “one picogram is the amount of weight of DNA in one hummingbird cell,” says McQuiston. “It was obviously a very tall order.”
The conceptual basis for this testing is a leak of proteins from the brain into the bloodstream. Dr McQuiston likens the concept to that of a piñata: “the harder it is hit, the more sweets fall out.” In practice, that means a measurable rise in these proteins can flag injuries that would never appear on a scan, turning what was once a judgement call into a traceable lab result.
The integration of these tools into healthcare systems offers several systemic advantages:
- Rapid triage: Results are available within 15 minutes, allowing for immediate bedside or pitchside decision-making and clearer return-to-play or return-to-work guidance.
- Reduced resource strain: Objective blood tests can reduce unnecessary CAT scans by up to 40 per cent, lowering healthcare costs and patient radiation exposure while freeing capacity in busy emergency departments.
- Precision frameworks: These markers are part of the CBI-M system, which combines clinical assessment, blood markers, imaging, and personal modifiers like medical history and sex-specific risk factors to create a more accurate diagnosis.
As regulators update safety standards for sport and workplaces, these tests are beginning to inform protocols in the same way that troponin transformed the diagnosis of heart attacks. In countries that follow the World Health Organization’s gender and health guidance, failure to incorporate such tools and sex-disaggregated data increasingly sits at odds with declared policy on equal access to safe care.
Systemic Barriers and Public Health Implications
Beyond biology, social and structural factors contribute to the under-reporting and mismanagement of concussions in women. The “caretaker response” represents a systemic failure where women, often the primary caregivers in a household, prioritize the needs of others over their own neurological recovery. A mother who has fallen on the stairs may still be the one driving children to school the next morning.
“That can be because of the ‘caretaker response’: what happens when the person that takes care of the family needs to be taken care of?” Dr McQuiston explains. Additionally, women entering male-dominated sports may avoid seeking help to avoid being perceived as weak or may lack the time for check-ups due to domestic responsibilities. For governing bodies that have invested heavily in promoting women’s participation in contact sports, the risk is that inclusion outpaces the safeguards designed with women in mind.
While sports receive the most attention, public health data emphasizes that 97 per cent of concussions occur in non-athletes. “The number one cause is gravity; the number one age group is 65 and up, and that is predominantly the age of falls,” says Dr McQuiston. As populations age, that has clear implications for social care systems, pension funds and long-term disability planning.
Prevention remains the primary goal for clinical trial registries and public health initiatives, as initial injuries increase future risk. “After you have one concussion, you’re more vulnerable to getting repeat concussions.” That risk compounds quickly for older adults who have already experienced a fall, or for women balancing paid work, unpaid care and recreational sport with little time for rehabilitation.
From a preventative standpoint, sleep hygiene is identified as a critical, though often overlooked, health intervention. “When you don’t get enough sleep, your reaction time is off. Your critical thinking is off. All of these little micro things that you’re not paying attention to are not optimised.” For policymakers designing national fall-prevention and road-safety campaigns, such seemingly mundane factors are emerging as low-cost levers that could reduce the burden of brain injury, particularly for women whose risks are still routinely underestimated.
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