On 28 October 2026, Sir Patrick Stewart, Captain Picard to one generation and Professor X to the next, died at 86. The announcement spoke of a “brief and poignant journey” with Alzheimer’s disease and Lewy body dementia, a diagnosis that had not been made public before.

Most of us have heard of Alzheimer’s. Far fewer have heard of its close cousin, and that is exactly why this moment is worth using.

His family has shared little about his symptoms, so nothing below claims to describe his illness. This is what the disease generally looks like.

Lewy body dementia in one minute

Inside brain cells, a protein called alpha-synuclein can misfold and clump into round deposits called Lewy bodies, named after the German neurologist Friedrich Lewy, who first described them in 1912. It is the same protein behind Parkinson’s disease. Where the clumps gather decides the symptoms: in movement circuits they cause stiffness and slowness, and in areas for attention and vision they cause confusion and hallucinations.

• It is the second most common degenerative dementia after Alzheimer’s.
• “Lewy body dementia” is an umbrella for two conditions: dementia with Lewy bodies (DLB) and Parkinson’s disease dementia (PDD). The difference is timing, the so-called one-year rule. If thinking problems appear before, or within a year of, movement problems, it is DLB. If movement problems come first by more than a year, it is PDD.

Why Stewart’s story is also a lesson: it is often “both”

He was reported to have both Alzheimer’s and Lewy body dementia. That is common, not unusual. In a pathology study of 495 people with DLB, most (341) also had extensive Alzheimer-type changes in the brain. Real brains do not always follow textbook boxes, which is one reason diagnosis is hard.

Five clues: “It isn’t just memory”

1. Good days and bad days. Sharp and chatty yesterday, staring and drowsy today. This is a feature of the disease, not pretending. (Fluctuating cognition)
2. Seeing things that are not there. Typically well-formed and vivid: children, animals, strangers sitting in the room. (Recurrent visual hallucinations)
3. Acting out dreams. Shouting, punching, kicking or falling out of bed during sleep. This can begin years, even a decade or more, before the dementia. (REM sleep behaviour disorder)
4. Parkinson-like slowing. Shuffling steps, stiffness, tremor, a softer voice, a stooped posture. (Parkinsonism)
5. Attention, planning and spatial trouble more than memory early on. Getting lost in a familiar house, misjudging steps and distances, losing the thread of a conversation.

Supporting clues: fainting or dizziness on standing, repeated falls, severe constipation, loss of smell, daytime sleepiness, depression or anxiety, and a dangerous reaction to certain medicines (see below).

How doctors decide: the current criteria

The standard is the Fourth Consensus Criteria of the DLB Consortium (McKeith et al., 2017). A person must have dementia, plus the features above:

• Probable DLB: two or more core features, or one core feature plus a positive indicative test.
• Possible DLB: one core feature without a test, or a positive test without a core feature.
• Indicative tests: a DaTscan (dopamine transporter imaging), an MIBG heart scan, or an overnight sleep study showing REM sleep without muscle paralysis.

The early, “prodromal” phase can look like mild memory-and-thinking trouble, a delirium episode, or a first-time psychiatric illness in an older adult. Newer alpha-synuclein “seed” tests on spinal fluid or skin are being studied and may change how we diagnose, but they are largely research tools today.

Why awareness saves lives

1. The wrong medicine can harm. Many people with DLB react severely to common antipsychotics (for example haloperidol), with sudden stiffness, deep confusion, or worse. Always tell any doctor or emergency team “suspected Lewy body dementia” before a sedative or antipsychotic is given. Never start or stop a medicine without your neurologist.
2. Some treatment helps. Cholinesterase inhibitors often ease thinking problems and hallucinations, and sleep, blood-pressure and movement symptoms can be treated. There is no cure, but there is a lot that can be done.
3. There are early warnings. Dream-enactment, constipation and loss of smell can precede the dementia by years.
4. Families deserve answers. “He is not mad, not lying, and not possessed. His brain is ill.”

The India angle

• Roughly 7 in 100 Indians over 60 are estimated to live with dementia (LASI-DAD), several million people. Lewy body disease is under-recognised among them.
• Hallucinations are often read as possession, the evil eye or “madness”, so families may visit faith healers before a neurologist, and years are lost.
• Because memory can be spared early, DLB is dismissed as normal ageing. Patients are scolded for being “lazy” or “dramatic” on bad days.
• Care usually falls on the family, most often daughters and daughters-in-law. Caregiver exhaustion is real and deserves attention too.

What to do if this sounds familiar

• If a parent or relative shows two or more of the clues, see a neurologist or geriatrician.
• Bring a diary of good and bad days, a video of any night-time episodes (with consent), and a list of all medicines.
• Make the home safer: night lights, clear floors, grab rails, and no driving once judgement is affected.
• When hallucinations appear, stay calm. Do not argue. Reassure, and check whether they are frightening the person.
• Look after the caregiver. Ask for help.

Remembering Patrick Stewart

He spent a lifetime giving voice to other people’s words. Let his passing give a voice to a disease that is too often silent. Recognising it early can mean the right medicine, the right care and a family that understands.

This note is for general awareness and is not a substitute for medical advice. To consult a specialist, contact PDMDC: +91 70266 03300 | movementdisordersclinic.com

References

• McKeith IG et al. Diagnosis and management of dementia with Lewy bodies: Fourth consensus report of the DLB Consortium. Neurology 2017;89:88–100.
• Kaivola K et al. Genetic evaluation of dementia with Lewy bodies implicates distinct disease subgroups. Brain (pathology cohort of 495 DLB cases).
• Lee J et al. Prevalence of dementia in India: LASI-DAD. JAMA Neurology 2022.
• Reports of Sir Patrick Stewart’s death and diagnosis: RTÉ, Rolling Stone, CBC, Yahoo Entertainment, 29–30 October 2026.

 

Frequently asked questions about Lewy body dementia

1. What is Lewy body dementia?
Lewy body dementia is a brain disease in which a protein called alpha-synuclein clumps into deposits (Lewy bodies) inside nerve cells. It affects thinking, attention, movement, sleep and mood. It is the second most common degenerative dementia after Alzheimer’s disease.

2. Is Lewy body dementia the same as Alzheimer’s disease?
No, but they often overlap. Alzheimer’s usually begins with memory loss. Lewy body dementia more often begins with fluctuating alertness, vivid hallucinations, dream-enacting sleep and slowed movement. Many people have both, which was reported in Patrick Stewart’s case.

3. What are the early signs of Lewy body dementia?
Watch for good days and bad days, seeing people or animals that are not there, shouting or acting out dreams in sleep, Parkinson-like stiffness or slowness, and trouble with attention, planning or judging space. Two or more together should prompt a neurologist visit.

4. How is dementia with Lewy bodies different from Parkinson’s disease dementia?
Timing separates them. If thinking problems begin before, or within a year of, movement problems, it is called dementia with Lewy bodies. If Parkinson’s movement symptoms come first by more than a year, it is Parkinson’s disease dementia.

5. How is Lewy body dementia diagnosed?
A neurologist diagnoses it from the history and examination, using the 2017 DLB Consortium criteria. Probable DLB needs dementia plus two or more core features, or one core feature plus a supportive test such as a DaTscan, MIBG heart scan or sleep study.

6. Which medicines are dangerous in Lewy body dementia?
Many people react severely to common antipsychotics such as haloperidol, with sudden stiffness, deep confusion or worse. Tell every doctor or emergency team about suspected Lewy body dementia before any sedative is given. Never start or stop medicines without your neurologist.

7. Can Lewy body dementia be cured or treated?
There is no cure yet, but treatment can help. Memory-and-thinking medicines (cholinesterase inhibitors) often ease confusion and hallucinations. Doctors can also treat sleep problems, low blood pressure on standing, constipation, mood and movement symptoms, and support the caregiver.

8. Are hallucinations in dementia a sign of madness or possession?
No. Vivid hallucinations, often of children, animals or strangers, are a recognised symptom caused by changes in the brain. They are not madness, a curse or possession. Early medical care, rather than delay, gives the best chance of safe treatment.

9. Did Patrick Stewart have Lewy body dementia?
Reports of his death at 86 said he had a “brief and poignant journey” with both Alzheimer’s disease and Lewy body dementia. His family has not shared details of his symptoms, so this note describes the disease in general, not his illness.

10. When should I see a doctor, and who should I see?
See a neurologist or geriatrician soon if a relative shows two or more of the warning signs. Bring a diary of good and bad days, a video of night-time episodes (with consent) and a list of all medicines. PDMDC in Bengaluru can be reached at +91 70266 03300.