Dysautonomia: when the body's autopilot is misfiring and no one can say why.

Racing heart, dizzy spells, gut trouble, odd sweating. The label fits. The cause is what matters.

This page is about understanding the condition and the role the brain and nervous system can play in it. It is not a diagnosis. Your own clinicians know your case.

Getting the diagnosis right first

Dysautonomia is not one disease. It is a description: the autonomic nervous system (ANS), which controls involuntary functions like heartbeat, blood pressure, breathing and digestion, is not regulating them well. Symptoms can include a racing or irregular heart, lightheadedness on standing, fainting, trouble breathing, nausea, bloating, constipation, bladder problems, abnormal sweating and sexual difficulties.

Many medical conditions can damage or disrupt autonomic nerves: diabetes, multiple sclerosis, Parkinson's disease, autoimmune conditions, amyloidosis, some infections and some medications. The ATNS Index of Neuroplastic Symptoms is firm on this point. These diseases of organs and structures must be looked for first. That means a thorough history and examination, and often blood tests, heart monitoring, a tilt-table test and sometimes nerve or autonomic function testing. Fainting, chest pain, breathlessness, new weakness or numbness, or loss of bladder control need prompt evaluation.

The neuroplastic contribution

The index then says: if none of these diseases is present, the person should be evaluated for neuroplastic symptoms.

Neuroplastic symptoms are real, physical symptoms produced by learned patterns in the brain and nervous system rather than by ongoing damage in the body. They are not imaginary and not a sign of anxiety alone. The autonomic nervous system is the body's threat-response system. When the brain learns that the world, or the body itself, is dangerous, it keeps the sympathetic fight-or-flight branch turned up and the calming parasympathetic branch turned down. Over time this becomes a default setting. The result is exactly the picture many people with unexplained dysautonomia describe: a heart that overreacts to standing, a gut that stalls, sweat and temperature that swing, and a feeling of being permanently on alert.

Because the brain learned this setting, it can learn another. That is what makes a neuroplastic evaluation hopeful rather than dismissive. It overlaps with what we describe in central sensitization and with conditions like POTS and long COVID.

What the research shows

Most of the research on dysautonomia without an organ cause comes from POTS, its best-studied form. There is no large trial of a neuroplastic approach yet, but the direction of the evidence is consistent.

• A 2025 case-control study of 305 people with POTS found that about 87% met criteria for central sensitization, and those who did also reported more anxiety and depression. The design is cross-sectional and from one center, so it shows overlap, not cause.
• An earlier controlled study found that people with POTS reported more anxiety than healthy controls, but their heart-rate jump on standing was not explained by anxiety. That is a useful reminder: these symptoms are real physiology, not nerves or imagination.
• A recent study of people with hypermobile Ehlers-Danlos syndrome or hypermobility spectrum disorder split them by central sensitization status. The sensitized group had far higher cardiac dysautonomia scores (median about 36 versus 5) and higher anxiety and depression scores. The design is correlational and cannot show direction, but it ties autonomic symptoms to a sensitized nervous system in a direct, measurable way.
• A 2026 pilot trial tested POTS Reprocessing Therapy, a brain-body treatment adapted from pain reprocessing therapy, and reported on its feasibility and preliminary outcomes. It was a small pilot, so it is a first signal rather than proof.

Taken together, this supports the ATNS position: once organ disease has been excluded, a sensitized central nervous system is a plausible and treatable driver of autonomic symptoms.

Signs the brain may be part of the picture

• Extensive testing has found no diabetes, neurological disease, autoimmune cause or medication effect.
• Symptoms began during or after a period of illness, trauma, major stress or burnout.
• Symptoms move around and multiply: heart one month, gut the next, then dizziness and temperature swings.
• Flares follow emotional events, poor sleep or fear about the symptoms themselves.
• You have other sensitized conditions, such as migraine, irritable bowel, fibromyalgia or chronic fatigue.
• Tracking your heart rate or symptoms has become constant and makes things feel worse, not better.

A solution that addresses it

When the brain's threat setting is part of the problem, there is an approach that addresses it: pain and symptom reprocessing. It teaches how neuroplastic symptoms work, uses somatic tracking (observing a racing heart or lightheaded feeling with curiosity rather than alarm), lowers fear and the sense of danger, builds a graded return to upright activity and daily life, and draws on emotional awareness and expression and acceptance and commitment skills. Trained clinicians deliver it, and digital programs increasingly do too. Our pages on ACT and the fear-avoidance cycle explain the key ideas.

Cindra is a daily AI companion built around these approaches, with daily check-ins, short practices and plain-language lessons, for people whose symptoms have a neuroplastic component. You can join the waitlist.

What to do next

1. Complete the medical workup with your doctor, a neurologist or a cardiologist. Make sure diabetes, neurological disease, autoimmune conditions, heart rhythm problems and medication effects have been considered.
2. If no organ or structural cause is found, ask directly: could my symptoms fit a neuroplastic pattern? Bring the list of signs above.
3. If they might, start learning about neuroplastic symptoms and practising skills that lower threat, alongside any supportive measures your doctor recommends (fluids, salt, compression, graded exercise).

Seek urgent care for fainting with injury, chest pain, severe shortness of breath, new weakness or numbness, confusion, or loss of bladder or bowel control.

This article is for general education and is not medical advice, and it does not diagnose or treat any condition. Persistent symptoms deserve a proper medical assessment to rule out disease or injury before a neuroplastic explanation is considered. If your symptoms are new, changing, or come with red-flag signs such as fever, unexplained weight loss, numbness or weakness, chest pain, or loss of bladder or bowel control, see a clinician promptly.