Dementia is more than memory loss — and rare forms are often missed

Dementia extends beyond memory loss, affecting language, behavior, and daily functioning. Rare forms are frequently overlooked or misdiagnosed, highlighting the need for increased awareness, early detection, and specialized care to manage diverse cognitive, emotional, and neurological symptoms effectively

Hyderabad: When most people hear the word “dementia”, they think of forgetfulness. But doctors say this common understanding is incomplete. Dementia is not a single disease—it is an umbrella term for more than 100 conditions that affect the brain in different ways, including speech, behaviour, movement and even vision.

While Alzheimer’s disease accounts for roughly 60% of cases and is strongly linked to memory loss, the remaining 40% involve rarer subtypes. These forms often present with unusual symptoms, making them harder to recognise and diagnose early.

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Why are rare dementias overlooked?
Many lesser-known dementias do not begin with memory problems. Instead, early signs may include difficulty walking, changes in personality, or trouble seeing clearly. Because these symptoms overlap with other neurological conditions, diagnosis is often delayed—affecting timely care and support.

What are some of these rare types?

Posterior cortical atrophy (PCA):
This condition affects how the brain processes visual information. People may struggle to read, judge distances or navigate spaces. Memory often remains intact in early stages, which can make the condition harder to identify.

 Creutzfeldt-Jakob disease (CJD):
An extremely rare disorder affecting about one in a million people, CJD progresses rapidly. It is caused by abnormal proteins in the brain and leads to severe cognitive decline along with movement problems such as sudden jerks.

FTD-MND:
This form combines frontotemporal dementia with motor neurone disease. Patients experience both cognitive decline and physical symptoms like muscle weakness, stiffness and difficulty swallowing. In some cases, it is linked to inherited genetic mutations.

Progressive supranuclear palsy (PSP):

Often mistaken for Parkinson’s disease, PSP affects balance, eye movement and thinking ability. Frequent falls, vision problems and difficulty concentrating are common early signs.

Why early recognition matters
There is currently no cure for dementia, and treatments are limited—particularly for rare types. However, early diagnosis can make a significant difference. Understanding whether a person is more likely to struggle with movement, vision or behaviour allows families and healthcare providers to plan appropriate care.

The bigger picture
Experts say it is crucial to move beyond the idea that dementia only affects memory. Warning signs can include changes in behaviour, speech difficulties, visual disturbances or mobility issues.

Greater awareness of these diverse symptoms could lead to earlier diagnosis and better care. As research continues, recognising the full spectrum of dementia remains key to improving outcomes for patients and their families.