Lewy body dementia stages: a family guide to symptoms, progression and care

In many families, the first sign is the dreams. Years before anyone says the word Lewy, a husband who always slept soundly starts kicking and shouting in his sleep, and one night he swings an arm hard enough that his wife moves to the guest room. He doesn't remember any of it. The doctor says it's probably stress.

Then come the scattered things. He sees a cat on the porch that isn't there. Some days he's completely himself; other days he's foggy and slow. A fall leads to a hospital stay and a stretch of confusion that seems out of proportion. It can take a long time before a neurologist puts the pieces together.

This guide explains the Lewy body dementia stages as families experience them, the early signs that are easy to miss, a medication risk every family must know about, and what care at home looks like as the disease moves on.

What Lewy body dementia is

In Lewy body dementia, a protein called alpha-synuclein forms abnormal clumps, called Lewy bodies, in brain cells that control thinking, movement, sleep, mood and automatic functions like blood pressure and digestion. According to Alzheimers.gov, more than 1 million people in the U.S. are diagnosed with it, making it one of the most common forms of dementia.

LBD covers two related conditions. In dementia with Lewy bodies, thinking problems come first or at about the same time as movement problems. In Parkinson's disease dementia, a person has had Parkinson's movement symptoms for at least a year before dementia develops. The brain changes are the same, and so is much of the care.

There's no cure and no treatment that slows the disease itself, but many of its symptoms can be eased. The Lewy Body Dementia Association puts typical lifespan after diagnosis at about five to seven years, with a lot of variation, and observes that the pace of early symptoms may hint at the pace of what follows.

The early signs families miss

LBD is often mistaken at first for Alzheimer's, Parkinson's, depression or a psychiatric illness, because its early signs are scattered and come and go. Looking back, families usually recognize several of these:

Acting out dreams

During normal dreaming sleep, the body is briefly paralyzed. In REM sleep behavior disorder, that paralysis fails and the person punches, kicks, shouts or falls out of bed while dreaming. It can begin years before memory or movement problems, and it's one of the strongest clues pointing toward LBD rather than Alzheimer's.

Seeing things that aren't there

The Lewy Body Dementia Association reports visual hallucinations in up to 80 percent of people with LBD, often early on. They tend to be detailed and specific: children on the sofa, a dog walking through the room, a stranger at the foot of the bed. Early on, many people know the visions aren't real and aren't frightened by them. That insight often fades later.

Good days and bad days

Attention and alertness swing, sometimes hour to hour, sometimes week to week. One day he's sharp and joking; the next he stares into space and takes minutes to answer a simple question. The swings can look like delirium. They also cause family friction, because relatives who visit on a good day can't see what the main caregiver is describing.

Parkinson's-like movement

Stiffness, slowness, shuffling steps, a soft voice, a blank facial expression, and sometimes a tremor. In some people these come first; in others they follow the thinking changes.

Body signals that don't look neurological

Loss of smell, stubborn constipation, dizziness or fainting when standing up, and unusually severe confusion after a routine procedure or a cold. Each is ordinary alone. Together they form a pattern.

The stages: a map, not a schedule

The Lewy Body Dementia Association is clear that there are no formally defined stages of LBD the way there are for Alzheimer's. Families and some clinicians borrow the seven-stage Global Deterioration Scale from Alzheimer's care as a rough guide. Use it as a map, not a calendar. People with LBD can sit in one stage for years, skip ahead, or seem to slip back on a good week.

Stages 1 to 3: before diagnosis

At first there are no visible symptoms. Then come small changes that are easy to explain away: forgetfulness, trouble concentrating or juggling tasks, a first hallucination that doesn't come back for months. Dream-enacting sleep may already have been going on for years. Some people are told they have mild cognitive impairment. Most families are still saying "he's just slowing down."

Stage 4: mild dementia and, often, the diagnosis

The changes are hard to ignore. Driving is no longer safe. Bills become confusing. Hallucinations come more often. Movement slows and balance becomes shaky. Many people are diagnosed in this stage, sometimes after a hospital stay triggers a sudden, dramatic worsening.

Stage 5: moderate dementia, delusions and falls

Living alone is no longer safe. The person may lose track of the day, get lost in their own home at night, or not recognize the bathroom. Delusions can join the hallucinations, and falls become more frequent. Long daytime naps and broken nights are common. Regular help at home is usually needed by now.

Stage 6: severe dementia and swallowing trouble

Speech shrinks to a few words. Walking needs a walker and then a wheelchair. Swallowing problems appear, raising the risk of choking and pneumonia. Continence is usually lost. There are still flashes of recognition, a grandchild's name or a favorite song, and families hold on to them.

Stage 7: mostly in bed

The person is mostly in bed and communicates with eyes, touch and sounds. Swallowing is very difficult and sleep fills most of the day. Pneumonia, falls and complications of immobility are common causes of death. This is when hospice care can help most, and it's easier to arrange when the family has talked about it ahead of time.

The medication danger every family must know

This is the most important section of this guide. People with LBD can react severely to antipsychotic drugs, the medicines often given in hospitals and emergency rooms for agitation or hallucinations. The Lewy Body Dementia Association reports severe sensitivity in up to 50 percent of people with LBD treated with traditional antipsychotics such as haloperidol: sudden worsening of thinking, heavy sedation, rigidity that can become permanent, and sometimes a reaction resembling neuroleptic malignant syndrome, which can be fatal.

The risk is greatest when the diagnosis isn't known. What protects your parent:

• Carry a wallet card that names the diagnosis and the medicines to avoid. The LBDA offers one.
• Tell every paramedic, emergency doctor and hospital nurse, out loud: "He has Lewy body dementia and is sensitive to antipsychotics."
• Keep a list of medicines the neurologist has said are acceptable, so hospital doctors aren't starting from scratch in an emergency.
• Ask before any new medicine, including over-the-counter sleep aids and bladder drugs, which can worsen confusion.

Doctors also use medicines that can help. Cholinesterase inhibitors, originally developed for Alzheimer's, may improve alertness, thinking and hallucinations in some people with LBD. If an antipsychotic is truly needed, a specialist chooses one of the few options considered safer and starts at a low dose. Medicines for Parkinson's movement symptoms can make hallucinations worse, so the neurologist balances the two.

What daily care looks like

LBD isn't necessarily harder to care for than other dementias, but it's harder to predict. A steady stretch can be followed by a Tuesday when everything falls apart, then partial recovery. The help has to flex with it.

Falls

Stiffness, drops in blood pressure on standing, swinging attention and hallucinations add up to a high risk of falls. Remove throw rugs, secure cords, put grab bars in the bathroom and light the route from bed to toilet. Have your parent sit on the edge of the bed for a minute before standing. Nights need the most care.

Hallucinations

Early on, gently saying what is and isn't real can reassure. Later, arguing only upsets. Experienced caregivers acknowledge the feeling, then redirect: walk to a brighter room, put on music, offer a snack. Good lighting helps, because dim rooms, busy patterns and late-afternoon shadows make hallucinations worse.

Sleep

Dream-enacting sleep can injure the person or their partner. A separate bed, a low bed with padding nearby and nothing sharp on the nightstand all help. Doctors can suggest treatments, but they should be managed by someone who knows LBD.

Keep a daily log

Write down alertness, mood, hallucinations, movement, sleep, appetite and falls each day. Over a month the trend shows through the daily swings. A log gives the doctor something solid to work from, and it helps when a relative sees one good afternoon and decides things aren't so bad.

When to bring in help

Help often arrives after a crisis: a fall, a hospital stay, a night of frightening hallucinations. Help that starts earlier, a few mornings a week, gives someone a chance to spot the changes that come before a crisis.

Our Alzheimer's and dementia care starts where your family is. Early on, that might be a caregiver for a few mornings a week to handle bathing safely, take walks and keep an eye out for dizziness and other small changes that become big ones if missed. As the disease progresses, the hours grow.

Overnight care is often where LBD families need help first. Dream-enacting sleep, broken nights and bathroom trips on unsteady legs make the small hours a risky part of the day. A caregiver awake in the house lets the family caregiver sleep. When the needs become constant, 24-hour home care covers the whole day in shifts. For a parent whose LBD began with Parkinson's, our Parkinson's care covers the movement side too.

A registered nurse writes every care plan, and caregivers report changes the same day. In LBD, telling a bad day from a reaction to a new medicine or an infection takes a doctor's judgment, and the sooner the doctor hears about it, the better.

Planning while your parent can take part

The planning that matters most happens early, while your parent can still make and explain their own choices. The LBDA encourages families to start these conversations soon after diagnosis rather than years later:

• Who should make medical and financial decisions when they can't?
• Where would they want to live if home becomes too hard?
• How do they feel about hospital stays, feeding tubes and hospice late in the illness?
• What matters most to them on an ordinary day?

Put the answers into a health care power of attorney and an advance directive. Our guide to legal documents for aging parents explains which ones you need.

If the dreams have started, or the diagnosis is new and you're still taking it in, talk with our care team about the help that makes sense now and what may be needed later.