Memory Loss or Dementia? Early Signs and When to Worry

Posted By: Dr. (Prof.) Rohit Gupta on 07 Nov 2026

“I keep forgetting things. Is this the beginning of Alzheimer’s?” I hear some version of this question almost every week, often from someone in their fifties or sixties who has just walked into a room and forgotten why. Sometimes it is a son or daughter asking on behalf of a parent who has started repeating the same story three times in an evening.

Forgetfulness is a normal part of life. Dementia is not a normal part of ageing. The difficulty is knowing which one you are looking at, and that is what this article is about.

What dementia actually is

Dementia is not one disease. It is a group of conditions in which the brain gradually loses its ability to think, remember, reason and manage daily life. Memory loss is the most familiar symptom, but language, judgement, planning, mood and behaviour can all be affected.

The most common cause is Alzheimer’s disease. Next comes vascular dementia, which results from reduced blood flow to the brain, often after strokes or from years of uncontrolled blood pressure and diabetes. Others include dementia with Lewy bodies, frontotemporal dementia and the dementia that can develop in Parkinson’s disease. Many older people actually have a mix of two causes.

You can read more about how we evaluate and manage these conditions on my pages for dementia and Alzheimer’s disease.

Normal forgetfulness or something more?

Everyone loses their keys, forgets a name or misses an appointment now and then. The difference with dementia is that the changes are persistent, get worse over time and start to interfere with everyday life. This table shows the usual contrast.

One more clue: people with ordinary forgetfulness usually notice and worry about it themselves. In dementia, it is often the family who notice first, and the person may minimise or not recognise the problem.

Early signs families should not ignore

• Asking the same question again and again, or repeating stories within minutes
• Difficulty planning or following steps, such as cooking a familiar meal or using the phone
• Trouble managing money or making decisions that were once easy
• Getting lost while driving or walking to a familiar place
• Misjudging distances or having trouble reading and recognising faces
• Losing interest in hobbies, friends or work
• New mood changes, such as anxiety, low mood, suspiciousness or apathy
• Disturbed sleep, or acting out dreams in sleep

If you notice a few of these over several months, it is worth a proper assessment. Do not wait for the problem to become severe.

Causes of memory loss that can be treated

This is the part I most want families to hear. Not every memory problem is dementia, and some causes are reversible if they are found in time:

• Vitamin B12 deficiency. Common in India, especially among vegetarians, and it can affect memory, mood and nerves. I discuss its other effects in my article on numbness and tingling.
• Thyroid disorders. An underactive thyroid can slow thinking and memory.
• Depression and anxiety. These can mimic dementia, particularly in older adults.
• Sleep problems. Poor sleep and sleep apnoea affect attention and memory.
• Medicines. Some sleeping pills, anti-allergy medicines, and bladder and pain medicines can cause confusion.
• Alcohol. Long-term heavy use damages the brain.
• Infections and metabolic problems. Urinary infections, low sodium or poor liver and kidney function can cause sudden confusion.
• Structural problems. A collection of blood after a head injury (subdural haematoma), a brain tumour or normal pressure hydrocephalus can be treated surgically.

This is why I never label someone with “dementia” before looking for these causes.

Memory trouble that comes with unexplained blank spells, staring or episodes of confusion can also point to seizures, which are treatable. I explain this in my article on epilepsy and seizures.

The stroke connection

What is good for your heart is good for your brain. High blood pressure, diabetes, high cholesterol and smoking quietly damage small blood vessels in the brain, and strokes, even tiny ones that cause no obvious weakness, can lead to vascular dementia. If you have diabetes, my article on stroke prevention tips for diabetic patients is a useful place to begin, and the 10 early warning signs of stroke are worth knowing for everyone in the family. You can also read about our stroke care.

Who is at higher risk?

Age is the biggest factor, but it is not the only one. Risk goes up with:

• High blood pressure, diabetes and high cholesterol
• Smoking and heavy alcohol use
• Previous head injuries
• Hearing loss that is not corrected
• Depression, social isolation and physical inactivity
• Obesity in mid-life
• A strong family history, particularly of early-onset dementia

The encouraging point is that many of these can be modified. Keeping blood pressure and sugar under control, staying physically active, correcting hearing loss and remaining socially engaged all lower the risk.

How memory problems are evaluated

A proper assessment is more than a scan. I begin with a detailed conversation, ideally with a family member present, about what has changed and how quickly. Then:

1. Cognitive testing. Simple paper-based tests of memory, attention, language and planning give an objective baseline.
2. Neurological examination. To look for signs of stroke, Parkinson’s disease or other nerve problems.
3. Blood tests. Including vitamin B12, thyroid function, blood sugar, kidney and liver function, and sodium.
4. Brain imaging. An MRI, or sometimes a CT scan, to look for strokes, shrinkage, tumours or fluid build-up. I explain when scans are and are not needed in 9 questions I ask every patient with persistent headaches before ordering an MRI, and the same thoughtful approach applies here.

Sometimes further tests, such as spinal fluid analysis or specialised scans, are helpful. Most patients do not need them.

Treatment and care

There is no cure for Alzheimer’s disease yet, but that does not mean there is nothing to do. Medicines such as donepezil, rivastigmine, galantamine and memantine can ease symptoms and slow the loss of daily function in some patients, particularly if started early. Vascular dementia is managed by tightening control of blood pressure, diabetes and cholesterol, with blood-thinning medicines where indicated, to prevent further damage.

Equally important are the things that do not come in a tablet:

• A predictable daily routine, with clocks, calendars and labelled cupboards
• Regular physical activity, a walk every day if possible
• Mental and social engagement: conversation, music, puzzles, family gatherings
• Treating depression, poor hearing, vision problems and sleep disturbance
• Safety at home: no stove left on, no medicines left within reach, locks on doors if wandering is an issue

A word for caregivers

Caring for someone with dementia is exhausting. Anger, repetition and suspicion are symptoms of the illness, not deliberate behaviour. Speak calmly, use short sentences, do not argue about facts, and share the load among family members. Please look after your own sleep and health as well. Caregivers who are supported give better care.

When to see a neurologist

Book a consultation if memory or thinking problems have lasted more than a few weeks, are getting worse, are affecting work, money or safety, or are being noticed by family. Seek urgent care for sudden confusion, sudden trouble speaking or weakness, which may be a stroke.

I see patients at Accord Superspeciality Hospital, Budena Village, Sector 86, Faridabad (Mon–Sat, 10:00 AM–5:00 PM) and at my Neuro Clinic in Sector 17 (Mon–Sat, 5:30–8:30 PM). You can book an appointment online or call +91-9718044428. If you are unsure whom to consult, here is how to choose the right neurologist in Faridabad.

This article is for general awareness and does not replace a personal medical consultation.