For many women, ADHD isn’t just about the brain. It’s experienced through the body – in energy levels, nervous system responses and everyday wellbeing. A growing body of clinical observation and research is starting to clarify why this might be true, especially when conditions like Mast Cell Activation Syndrome (MCAS) and Postural Orthostatic Tachycardia Syndrome (POTS) appear alongside ADHD in some people. additudemag.com+1
What are MCAS and POTS?
Mast Cell Activation Syndrome (MCAS)
MCAS is an immunological condition in which mast cells – a type of immune cell that helps regulate inflammation and allergic reactions – respond too easily or too strongly, releasing chemical mediators such as histamine. This can cause widespread symptoms affecting multiple body systems, including skin reactions, digestive complaints, fatigue and neurological effects.
Postural Orthostatic Tachycardia Syndrome (POTS)
POTS is a form of dysautonomia, meaning it involves the autonomic nervous system – the part of the nervous system that controls heart rate, blood pressure and internal regulation. People with POTS may experience light-headedness, rapid heartbeat, fatigue and cognitive challenges when they stand up, due to abnormal heart-rate responses.
Although these conditions are distinct, clinicians increasingly notice them occurring together in the context of broader multisystem symptoms – particularly in women. additudemag.com
Why these connections matter
Attention, focus, energy and emotional regulation aren’t processes isolated in the brain. They rely on smooth interaction between the nervous system, immune response and hormonal balance.
Emerging evidence and clinical reports suggest overlapping features across ADHD, MCAS and POTS. Some of the mechanisms being explored include:
- Shared sensitivity to internal and external triggers, such as stress, temperature changes or food – including heightened mast cell responses. Edge Foundation
- Mast cell mediators influencing neurological pathways, potentially affecting cognition, arousal and mood regulation. PMC
- Autonomic regulation affecting attention and cognitive clarity, since the autonomic nervous system plays a role in alertness and physiological stability.
These connections don’t mean that MCAS or POTS cause ADHD, or vice versa, but they help explain why symptoms often co-occur and why focus, energy and regulation can feel so intertwined with physical wellbeing in some women. additudemag.com
How patterns show up in real life
People reporting these overlapping profiles often describe:
- Fatigue that fluctuates and doesn’t always correlate with activity
- Brain fog and difficulty sustaining attention
- Sensitivity to heat, food, chemicals or stress
- Rapid heartbeat or dizziness on standing
- Skin, digestive or allergic-type symptoms that vary over time
These experiences can feel deeply frustrating – especially when standard ADHD descriptions focus only on behaviour or cognition. Recognising the body’s role doesn’t diminish the neurological aspects of ADHD; it enriches our understanding of the lived experience. additudemag.com
What women are saying
For so many neurodivergent women, symptoms shift across the menstrual cycle, during perimenopause and through menopause, suggesting that hormones interact with nervous system regulation and immune patterns. This interplay adds another dynamic layer that deserves compassionate attention. additudemag.com
Where research is headed
Scientists and clinicians are only beginning to map how immune dysregulation and autonomic function intersect with ADHD traits. While large-scale, definitive studies are still emerging, current evidence supports:
- A need for holistic assessment when symptoms span multiple systems
- Greater clinical awareness of overlaps among neurological, autonomic and immune processes
- Recognition that neurodivergent women often experience symptom clusters that aren’t captured by siloed approaches additudemag.com
Key takeaways
Understanding how ADHD feels in the body offers a richer, more compassionate way to make sense of persistent symptoms that have long been misunderstood or overlooked.
By exploring connections with MCAS and POTS – and acknowledging the broader physiological context – we open doors to care that honours the whole person, not just behaviours.
Photo by Valeriia Miller on Unsplash