Lewy body dementia vs. Alzheimers sjukdom:<br> Viktiga skillnader och likheter

Läkaren har gett din närstående diagnosen Alzheimers sjukdom. Men något stämmer inte riktigt. De ser människor som inte finns där. Tankeförmågan verkar skarp ena stunden och förvirrad nästa. De har utvecklat en darrning som inte nämndes i något du läst om Alzheimers.

Det du faktiskt kan ha att göra med är Lewy body-demens, en annan typ av demenssjukdom som ofta förväxlas med Alzheimers. Även om båda tillstånden påverkar minnet och tankeförmågan, har de tydliga drag som skiljer dem åt.

Lewy body-demens och Alzheimers sjukdom delar överlappande symtom, vilket är anledningen till att läkare som inte är bekanta med de unika egenskaperna hos LBD ofta förväxlar den ena med den andra. Denna feldiagnostisering är viktig eftersom behandlingar som hjälper vid Alzheimers sjukdom kan vara farliga för personer med Lewy body-demens.

Den här guiden förklarar de viktigaste skillnaderna och likheterna mellan Lewy body-demens och Alzheimers så att du kan känna igen vad du har att göra med och se till att din närstående får rätt vård.

Är Lewy body-demens samma sak som Alzheimers sjukdom?

Nej, Lewy body-demens och Alzheimers sjukdom är två skilda tillstånd, även om båda orsakar progressiva problem med tankeförmåga och minne. Skillnaderna ligger i vilka symtom som uppträder först, hur många andra symtom som förekommer, hur de fortskrider och vad som händer i hjärnan på cellnivå.

Vilka är de främsta skillnaderna mellan Lewy body-demens och Alzheimers?

De mest märkbara skillnaderna mellan LBD och Alzheimers syns i vilka symtom som visar sig först och hur många andra symtom som uppstår. Om du försöker ta reda på om din närstående kan ha LBD istället för Alzheimers, eller tvärtom, är detta de tydligaste tecknen att hålla utkik efter.

Minnesförlust yttrar sig på olika sätt

Alzheimers visar sig vanligtvis genom minnesproblem. Din närstående kan glömma nyligen inträffade måltider eller samtal, ha svårt att komma ihåg bekanta namn eller upprepa samma fråga flera gånger. Minnesförlust är oftast det första familjen märker och anledningen till att de söker medicinsk hjälp.

Lewy body-demens påverkar också minnet, men det är sällan huvudproblemet, särskilt i ett tidigt skede. Din närstående kan minnas gårdagens händelser perfekt men ha svårt att hålla fokus på vad du säger just nu, eller behöva tid för att svara. De har svårt att organisera sina tankar, hitta rätt ord eller räkna ut ordningsföljden för vardagliga uppgifter. Problemet är inte så mycket att lagra minnen som att använda hjärnan i stunden. Problemen rör exekutiva funktioner, det vill säga förmågan att utföra flera saker samtidigt och att lösa problem.

Hallucinationer berättar en tydlig historia

Detta är ett av de enklaste sätten att upptäcka skillnaden.

De flesta med Lewy body-demens upplever synhallucinationer, vanligtvis inom de första åren. Det är inte diffusa skuggor eller otydliga former. Det är detaljerade, levande bilder. Din mamma kan lugnt berätta om barnen som leker i hörnet, se små djur eller mannen som sitter i den tomma stolen. Hon ser dem lika tydligt som hon ser dig. Dessa hallucinationer sker upprepade gånger, ofta med samma karaktärer eller teman.

Hallucinationer kan förekomma vid Alzheimers sjukdom, men det är ovanligt. När de väl uppstår är det vanligtvis i ett sent skede efter år av minnesnedgång.

Vakenhet ändras under dagen (fluktuationer)

Observera hur den kognitiva förmågan förändras under dagens gång, så kommer du att se en stor skillnad.

People with Lewy body dementia can seem completely normal and engaged at breakfast, then by lunch, they seem distant. Two hours later, they may be back to themselves. These fluctuations happen unpredictably and can be dramatic. One minute, they’re having a coherent conversation about current events, the next, they’re struggling to process what you’re saying.

Alzheimer’s doesn’t work this way. People with Alzheimer’s have good days and bad days, but they don’t typically swing from clear-headed to confused within the same period.

Movement Problems Appear Early in LBD

Watch how your loved one walks and moves, and you might notice important clues.

Lewy body dementia often causes movement problems that look like Parkinson’s disease. Hands might tremble at rest. Walking becomes slower and a person may shuffle. Getting up from a chair becomes more challenging. Balance becomes shakier. These movement changes can show up early, sometimes even before thinking problems become obvious.

Alzheimer’s doesn’t cause these movement issues until very late in the disease, if at all. Someone with Alzheimer’s typically maintains their usual mobility in early and middle stages, but may eventually have trouble with coordination after many years.

Sleep Problems Look Different

Both conditions disrupt sleep, but in distinct ways.

REM sleep behavior disorder is a hallmark of Lewy body dementia and often shows up years before other symptoms. During normal REM sleep, your body becomes temporarily immobile so you don’t act out your dreams. In people with this disorder, that protective immobility doesn’t work properly. Your loved one physically acts out their dreams, potentially kicking, punching, or shouting during sleep. This can lead to injuries for them or their sleep partner.

Alzheimer’s causes different sleep issues. People might have trouble falling asleep, wake frequently during the night, or experience day-night confusion where they’re awake at 3 AM and sleeping during the day. But they don’t typically act out dreams violently.

Vad händer i hjärnan

Both conditions involve abnormal proteins damaging brain cells, but the culprits are different.

In Alzheimer’s disease, two proteins cause problems: beta-amyloid and tau. Beta-amyloid forms sticky plaques between brain cells, while tau creates tangles inside them. These deposits kill brain cells, particularly in areas that handle memory and learning. The damage spreads gradually through the brain over many years.

In Lewy body dementia, a protein called alpha-synuclein clumps together inside brain cells. These clumps, called Lewy bodies, interfere with how cells communicate. They show up in multiple brain regions at once, affecting areas that control movement, thinking, sleep, and behavior simultaneously.

Some people have both types of protein deposits. This overlap is why diagnosis can be tricky and why some people show features of both conditions.

Which Progresses Faster: Lewy Body Dementia or Alzheimer’s?

The timeline from early symptoms to advanced disease differs between these conditions, and understanding this can help you plan for the future.

Alzheimer’s typically develops slowly over 8 to 10 years, though some people decline faster and others slower. The progression usually follows a predictable pattern. Early years bring primarily memory problems and mild confusion. Middle years involve increasing difficulty with daily tasks, more significant confusion, and personality changes. Later years require full-time care as the person loses the ability to fully communicate and care for themselves properly.

Lewy body dementia tends to move faster for some, though not all, with many people progressing from diagnosis to advanced stages within 5 to 8 years. But the progression feels different because multiple symptoms may worsen simultaneously rather than in a clear sequence. Cognitive problems, movement difficulties, and behavioral symptoms can advance together, making the decline feel more chaotic and unpredictable than Alzheimer’s steady trajectory.

This doesn’t mean LBD is always worse or faster for everyone. And each person with LBD progresses differently.  Some people maintain quality of life for many years with proper treatment and support, while others decline sooner. The key difference is the pattern of decline rather than just the speed.

Varför en korrekt diagnos är så viktig

Getting the right diagnosis isn’t just about putting a label on what’s happening. It directly affects treatment, safety, and effectiveness.

Medication Safety

People with LBD are extremely sensitive to medications.  Some medications commonly prescribed for Alzheimer’s-related behavior problems can be extremely dangerous for people with Lewy body dementia. Traditional antipsychotic drugs, such as haloperidol, should never be given and can cause severe reactions in LBD, including extreme sedation, dramatic worsening of movement problems, and dangerous blood pressure drops.  

If your loved one has LBD but their doctor thinks it’s Alzheimer’s, they might prescribe medications for behavior or aggression that could seriously harm them. This happens frequently in emergency rooms and hospitals where staff aren’t familiar with LBD.

Treatment Effectiveness

Medications that enhance brain function work differently for each condition. Drugs like rivastigmine often work better for Lewy body dementia than for Alzheimer’s. People with LBD who have movement problems might benefit from Parkinson’s medications that wouldn’t be prescribed for Alzheimer’s, though some people with LBD may not do well on these medications.  Getting the diagnosis right means accessing treatments that actually help rather than receiving treatments designed for a different condition.

Care Planning

The two conditions require different approaches to daily care. Lewy body dementia’s fluctuating alertness means you need flexible schedules and realistic expectations about hour-to-hour changes. The hallucinations require specific strategies that wouldn’t apply to most Alzheimer’s cases. Movement problems create fall risks that need different safety modifications.

Knowing which condition you’re dealing with helps you prepare for these challenges rather than being caught off-guard when symptoms don’t follow the expected pattern.

Behandlingsmetoder för respektive tillstånd

The treatments that help one condition aren’t always right for the other, and some can actually be dangerous when used incorrectly.

Memory and thinking medications like donepezil, rivastigmine, and galantamine can help both conditions, but they often work better for Lewy body dementia. Many doctors find rivastigmine particularly effective for LBD. These medications don’t stop the disease, but they can improve daily functioning and reduce some behavioral symptoms.

If your loved one has significant movement problems from LBD, their doctor might prescribe carbidopa-levodopa, the main medication for Parkinson’s disease. This can reduce tremor, stiffness, and slowness of movement. People with Alzheimer’s don’t need this medication because movement problems aren’t part of the condition until very late stages, if at all.

Both conditions benefit from non-medication approaches like regular exercise, cognitive activities, social engagement, and consistent daily routines. The specific home modifications and care strategies differ based on which symptoms are most prominent, but the overall principle of maintaining engagement and quality of life applies to both.

Can You Have Both Lewy Body Dementia and Alzheimer’s?

Yes, some people develop both Lewy body dementia and Alzheimer’s disease simultaneously. This is called mixed dementia, and it’s more common than many people realize.

Mixed dementia happens when someone has both the Lewy bodies characteristic of LBD and the plaques and tangles characteristic of Alzheimer’s. Brain autopsies show that many people diagnosed with one condition actually had signs of both.

For families, this creates additional complexity. Your loved one might show the memory problems typical of Alzheimer’s along with the hallucinations and movement issues typical of LBD. The combination can make diagnosis even more challenging and requires doctors to consider both conditions when planning treatment.

The medication sensitivities that apply to Lewy body dementia still apply when someone has mixed dementia. Even if Alzheimer’s is also present, the presence of Lewy bodies means that certain antipsychotic medications remain dangerous.

What Do Lewy Body Dementia and Alzheimer’s Have in Common?

Despite their important differences, LBD and Alzheimer’s share several key features that affect how families experience and manage these conditions.

Both are progressive neurodegenerative diseases, meaning they get worse over time and currently have no cure. In both conditions, abnormal proteins damage and kill brain cells, though the specific proteins involved are different. Both eventually affect a person’s ability to think clearly, remember information, and handle daily activities independently.

The emotional and practical challenges families face are similar with both conditions. You’ll likely experience grief over watching someone you love gradually change. You’ll need to adapt your home and routines to keep them safe. You’ll face difficult decisions about care as the disease progresses. You’ll need increasing levels of support over time.

Both conditions respond to similar caregiving approaches. Maintaining consistent daily routines helps reduce confusion. Staying socially engaged and physically active supports overall wellbeing. Creating a safe, familiar environment reduces anxiety and accidents. Treating the person with dignity and patience preserves their sense of self.

The importance of early diagnosis applies equally to both conditions. Getting the right diagnosis early allows you to access appropriate treatments, avoid dangerous medications, connect with relevant support services, and plan for future care needs while your loved one can still participate in decisions.

Perhaps most importantly, quality of life remains possible with both conditions. While these diseases bring real challenges, many people with Alzheimer’s or LBD maintain meaningful relationships, enjoy activities, and experience moments of joy for years after diagnosis. The key is adapting expectations and care to support what’s still possible rather than focusing solely on what’s been lost.

When the Diagnosis Doesn’t Seem Right

Many families dealing with Lewy body dementia spend months or even years being told their loved one has Alzheimer’s disease. The symptoms don’t quite match what they read about Alzheimer’s, but they trust the doctor’s expertise.

Here are signs the diagnosis might need a second look:

Your loved one was diagnosed with Alzheimer’s, but hallucinations started early and are frequent. Hallucinations happen in Alzheimer’s, but they’re not common, especially in early stages.

The cognitive problems fluctuate dramatically during the day. If your father seems fine at breakfast but can barely hold a conversation by dinner, and then seems better again the next morning, that pattern fits LBD much more than Alzheimer’s.

Movement problems appeared around the same time as thinking problems (or within the first year). If your mother developed a shuffle and tremor along with memory issues, rather than memory problems alone, LBD should be considered.

Medications prescribed for behavioral symptoms made things much worse. If antipsychotic drugs caused severe sedation or worsening confusion, that reaction raises red flags for LBD.

Trust your observations. You know your loved one better than anyone. If something feels off about the diagnosis, seek evaluation from a neurologist who has specific experience with Lewy body dementia, not just general dementia expertise, particularly a movement disorder neurologist..

Att hitta svar för din familj

If you’re questioning whether your loved one has the right diagnosis, or you’re trying to understand which condition best explains what you’re seeing, you’re not alone. Many families struggle with this confusion for months or years.

The combination of symptoms matters more than any single symptom. Alzheimer’s with early, frequent hallucinations is unusual. LBD without movement problems or fluctuating alertness is rare. Look at the overall pattern rather than checking off individual symptoms.

Whether your loved one has Alzheimer’s disease, Lewy body dementia, or both, getting connected with the right resources and support makes a significant difference. Understanding the specific condition helps you prepare for the right challenges, access appropriate treatments, and make informed decisions about care.

If you need help finding a specialist who understands both conditions, have questions about symptoms you’re observing, or just want to talk with someone who understands the complexity of these diagnoses, we’re here to help.

Vår hjälplinje är tillgänglig alla dagar om året från klockan 08.00 till 20.00 östkusttid på 516-218-2026 eller 833-LBDLINE. Du kan också nå oss via e-post på norma@lbdny.org.