Alzheimer's disease and dementia: understanding the difference

Memory change is only one possible feature. Difficulties with language, planning, orientation, judgement, mood, or familiar tasks may also occur. A proper assessment matters because different causes can produce similar changes, and some are treatable.

Dementia is an umbrella term rather than a single disease. Alzheimer's disease usually develops gradually and may present with increasing difficulty retaining recent information, finding words, navigating, organising tasks, or managing daily responsibilities. Other forms can begin with different cognitive, behavioural, movement, or visual symptoms.

Occasional forgetfulness does not by itself establish dementia. Clinicians look for a change from the person's previous abilities and whether it affects independence. Depression, sleep problems, medicine effects, thyroid disorders, vitamin deficiency, infection, and sensory loss can imitate or worsen cognitive difficulties.

Book a GP appointment when changes recur or interfere with medicines, money, cooking, driving, appointments, personal care, or safety. With the person's permission, someone who knows them well can describe the timeline and examples. Bring a complete medicine list and information about mood, sleep, alcohol use, hearing, vision, and other illnesses.

Assessment may include conversation about daily function, cognitive tasks, physical examination, and blood tests, with imaging or specialist referral when indicated. Meanwhile, simplify routines, use calendars and labelled storage, review fall and driving risks, and discuss future preferences while the person can participate fully.

Seek urgent medical help for confusion that starts suddenly or fluctuates sharply, especially with fever, breathing difficulty, severe headache, new weakness, facial droop, speech trouble, seizure, head injury, or unusual drowsiness. Sudden confusion can reflect an acute illness rather than gradual dementia.

Prompt support is also needed if the person is wandering into danger, leaving cooking unattended, misusing medicines, unable to eat or drink, experiencing distressing hallucinations, or at risk of harming themselves or someone else.

Ask which alternative causes are being checked, what the assessment suggests, whether referral is needed, and which treatments or supports match the person's difficulties. Discuss medicine supervision, driving, legal and financial planning, caregiver strain, communication strategies, continence changes, and a clear contact plan for new symptoms.