17815 Lewy Body Dementia
Informed by recognized medical guidance
Overview
Lewy body dementia (LBD) is a brain disorder that affects thinking, movement, sleep, and behaviour. It is caused by abnormal clumps of protein in the brain, called Lewy bodies, which damage brain cells over time. LBD is one of the most common causes of dementia.
Key facts
- It is a progressive condition, meaning symptoms slowly get worse over time.
- It can cause vivid hallucinations, where a person sees things that are not there.
- People with LBD often have changes in alertness, moving between being drowsy and being alert.
Lewy body dementia is the second most common type of progressive dementia after Alzheimer's disease. It is not rare, but it is often under‑recognised.
LBD usually begins after the age of 50, and the risk increases with age. It affects both men and women, though it is diagnosed slightly more often in men. Most people with LBD have no family history of the condition.
Symptoms
- Difficulty breathing or chest pain
- Signs of a stroke – face drooping, arm weakness, trouble speaking
- Seizures
- Unconsciousness or no response
- ⚠A sudden, severe increase in confusion or hallucinations
- ⚠A fall, especially if the person is taking blood‑thinning medicine
- ⚠Frightening hallucinations that cause aggression or risk of harm
- ⚠Inability to eat, drink, or manage day‑to‑day needs
- ⚠Fever with a change in behaviour, which could mean an infection
Common symptoms
- Trouble with concentration, memory, and problem‑solving
- Movement problems such as stiffness, slow movement, or a shuffling walk
- Visual hallucinations, like seeing shapes, people, or animals that are not there
- Sleep disturbances, including acting out dreams or thrashing in bed
- Fluctuating alertness – being very drowsy at one time and very alert at another
- Mood changes such as depression, anxiety, or apathy
Symptoms in children
- This condition is an adult‑onset brain disease and does not affect children.
Symptoms in older adults
- In older adults, memory loss may be more noticeable, and falls are more common.
- Older adults may become more withdrawn or confused and often need more daily support.
Causes
Main causes
- Abnormal clumps of protein in the brain, called Lewy bodies, that damage brain cells
- Changes in brain chemicals that help control thinking, movement, and mood
- The exact reason these clumps form is not yet fully understood
Risk factors
- Age over 50
- Being male
- Having a close family member with LBD or Parkinson's disease (a small increased risk)
- Certain rare genetic changes
When to see a doctor
See a doctor urgently if:
- Sudden changes in alertness, severe confusion, or very distressing hallucinations
- A fall, especially with a blow to the head
- Signs of infection, such as fever, shaking, or increased confusion
- Difficulty swallowing or choking
Book a routine appointment if:
- Ongoing problems with memory, thinking, or movement that affect daily life
- Sleep behaviours like acting out dreams or frequent waking
- Mood changes, such as persistent sadness, anxiety, or loss of interest
Diagnosis
There is no single test for Lewy body dementia. A doctor will take a detailed history, talk with the person and a family member or friend, and do memory and movement checks. They may refer you to a specialist, such as a memory clinic or a neurologist.
Tests that may be done
- A full assessment of symptoms and daily function
- Blood tests to rule out thyroid problems, vitamin deficiencies, or infections
- Memory and thinking tests
- Brain scans, such as an MRI, which can help rule out other causes
- A special scan called a DaTscan, which looks at brain chemical activity and may help tell LBD apart from other dementias
What to expect at your appointment
The diagnosis can take time, sometimes over several months. The doctor will explain the findings and what they mean. If LBD is confirmed, your care team will help you plan for treatment and support.
Treatment
There is currently no cure for LBD, but many symptoms can be managed well. Treatment focuses on supporting daily function, maintaining quality of life, and helping caregivers. The plan is individualised and often involves a team of doctors, nurses, therapists, and social care workers.
Self-care at home
- Keep a calm, regular daily routine to reduce confusion
- Stay physically active with safe activities like walking or chair exercises
- Make sure the home is well‑lit and free of clutter to prevent falls
- Set aside time for rest, and keep a good sleep routine
- Seek practical support from family and community services
Medical treatments
Medications can help with thinking, movement, and sleep. However, people with LBD can be very sensitive to certain types of medications, especially some that are used for hallucinations or agitation. A specialist will choose any medicine very carefully, monitor side effects, and adjust the plan as needed.
When is surgery considered?
Surgery is not used to treat LBD itself. If a person with LBD needs surgery for another health problem, the anaesthetic and painkillers can sometimes make confusion worse. Tell the surgical team about the LBD diagnosis in advance so they can adapt the plan.
Living with this condition
Focus on what the person can still do and enjoy. A calm, familiar environment with clear routines helps reduce stress and confusion. Involve the person in decisions about their care and daily activities as much as possible.
Lifestyle tips
- Stay engaged with enjoyable activities like reading, music, or simple hobbies
- Maintain social connections, but avoid crowded or noisy situations that may be overwhelming
- Plan activities at the time of day when the person is most alert and able
- Take regular breaks and encourage rest when needed
Diet and exercise
Eat a balanced diet with plenty of fruit, vegetables, and fluids. Some people with LBD develop swallowing problems, so meals may need to be softer. Gentle exercise, such as walking, can improve balance, mood, and sleep. A physiotherapist can recommend safe exercises and help with fall prevention.
Mental health and emotional wellbeing
LBD can be emotionally hard for both the person and their loved ones. Depression, anxiety, and frustration are common. Caregivers often feel stress and grief, too. Talking with a counsellor, psychologist, or support group can provide emotional relief and practical coping strategies.
Prevention
There is currently no proven way to prevent Lewy body dementia. A healthy lifestyle – staying physically active, eating well, sleeping well, and staying socially engaged – supports overall brain health, although it cannot guarantee prevention.
Vaccines
There is no vaccine to prevent Lewy body dementia.
Screening programmes
There is no routine screening test for LBD in people without symptoms.
Complications
If left untreated
- Worsening confusion and memory loss
- More frequent falls and serious injuries
- Difficulty swallowing, which can lead to pneumonia
- Weight loss and poor nutrition
- Loss of independence and need for full‑time care
Long-term outlook
Lewy body dementia is a serious condition that worsens over time, but many people live several good years after diagnosis. With the right support, symptoms can be managed, and people can maintain a meaningful quality of life. Research into better treatments is ongoing, and there is reason for hope.
Find support
International organisations
Local organisations
- Lewy Body Society (UK) ↗ · United Kingdom
- NHS – dementia support ↗ · United Kingdom
External links open third-party websites. Ruqelo Health is not responsible for external content. Listing an organisation does not imply endorsement.
Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
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Sources and guidance
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: August 1, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.