Autistic masking, hypertension, and the measurable cost of survival.

When I walk into a room, I look confident, measured and composed. People have questioned whether I am “really” autistic because I “present so well.” What they don’t see is what my body is really doing.

For the past couple of years, I have been treated for high blood pressure. Before beginning ADHD medication, screening identified hypertension, and despite medication, it remains unstable. Recently, I began monitoring and tracking my blood pressure trends more closely. The pattern is not random. It spikes when I leave the house, attend appointments, sit in Zoom or Teams meetings, take phone calls, or enter social environments where I must mask. Readings repeatedly rise to 160–170 systolic and up to 130 diastolic. That is Stage 2 hypertension. That is medically significant. That is not imagination or exaggeration. And it happens while I appear calm – while you think I am coping well!

When I say masking is intense, I am not speaking metaphorically. My blood pressure monitor does not care about narratives, identity, or perception. It does not inflate itself for sympathy. It records physiological load. When masking increases, my blood pressure increases. When I am required to socially perform, my nervous system escalates. When I return home and unmask, it drops. That is correlation. That is measurable. That is physical evidence. At the very least, it shows that when I describe the strain of masking, there is a clear and clinically significant impact on my body. I am not lying. I am not being dramatic. My nervous system is activating to a level classified as Stage 2 hypertension while I look composed.

Autistic masking  (also known as camouflaging) is not a buzz term. It is sustained cognitive and emotional labour: monitoring facial expressions, adjusting tone and rhythm, suppressing natural movement, forcing eye contact, translating social cues in real time, and managing sensory overload while appearing regulated. Research by Hull et al. (2017) identified camouflaging as a measurable autistic coping strategy associated with increased anxiety and exhaustion. Cassidy et al. (2018) found that higher camouflaging scores were linked to increased suicidality in autistic adults. Autistic individuals also show heightened autonomic nervous system activation during social stress, meaning the fight-or-flight response can engage even when behaviour appears composed. Chronic sympathetic activation increases heart rate, constricts blood vessels and elevates blood pressure over time. This is physiology. Outward calm does not equal internal calm. And my body proves that.

I was born in 1979, mixed race, and raised in a predominantly white town. Before I understood I was autistic, I believed my hypervigilance was purely racial trauma. I hated my skin colour, scratched my face out of photos, cried myself to sleep, and lived in constant alertness. Now I understand it a lot deeper. Autism processes threat differently – often more intensely, more literally. Add racism. Add undiagnosed neurodivergence. Add decades of masking. You do not get ease; you get a nervous system trained for survival.

CPTSD literature describes chronic hypervigilance and prolonged physiological arousal, and sustained activation is associated with long-term cardiovascular strain. When I am outside, I am not relaxed. I am scanning, containing, translating, and performing. My blood pressure rises accordingly – not occasionally, not abstractly, but consistently.

There is another layer. Even when I explain my struggles clearly, calmly and confidently, people often do not register the severity of what I am describing. Because I mask well, the very skill I developed to survive now works against me. Because I speak articulately, hold eye contact and appear composed, people subconsciously associate composure with capacity. They hear my words but do not attach weight to them. It is like standing in a building that looks perfectly fine from the outside, while the fire alarm is blaring in the control room. Because you cannot see smoke from the street, you assume there is no fire. But inside, the system is detecting and triggering an emergency response. They are objective, clinical and recorded. They show that when I say I am masking, something real is happening inside my body.

There is also stigma. Many people still hold an outdated image of autism: white, male, socially withdrawn, visibly struggling, non-verbal, with an intellectual disability. If you do not match that stereotype, you can’t be autistic. I have been asked (sarcastically and challenging), “But why do you think you’re autistic?” on many occasions – always by people with no clinical knowledge on this topic at all. That question carries the same energy as another phrase I have heard throughout my life: “Racism doesn’t go on anymore.” It dismisses lived experience because it does not fit the observer’s narrative. Autism, like racism, is often disbelieved when it does not look how someone expects it to look. And when you are a person of colour and autistic, those layers of dismissal intertwine. The better you present, the less credible your struggle appears.

Yet the body does not perform for approval. It responds to load.

This piece is not claiming that masking alone caused my hypertension. It is demonstrating that when masking is required, my autonomic nervous system activates to a clinically significant level. The data shows it. When I mask, my blood pressure rises into Stage 2 hypertension. When the demand reduces, it lowers. That is a clear physiological correlation between social masking and cardiovascular stress in my body. The numbers confirm what my words have been saying all along.

If autistic people say masking is exhausting, believe them. If they say society is overwhelming, believe them. If they say it is costing them their health, listen. Because sometimes the nervous system tells the truth louder than words. I should not have to collapse (or worse) to prove my experience is real to society, especially when the medical data is already there.