The effects of Alzheimer’s on the body

Alzheimer’s disease affects the whole body, not just memory. As brain cells become damaged, the signals that control movement, balance, swallowing, and bladder function are disrupted – physical changes that can appear at any stage of the condition and become more pronounced over time.

Understanding these physical changes helps you recognise symptoms early and provide appropriate care.

Key Insights:

• Alzheimer’s damages brain cells that control movement, balance, and coordination – physical changes often appear before severe memory loss.
• Falls are a major risk as the disease progresses, with spatial awareness and balance deteriorating even in early stages.
• Weight loss is common in advanced Alzheimer’s as people forget to eat, lose interest in food, or develop swallowing difficulties.
• Urinary tract infections occur more frequently in people living with dementia and can cause sudden increases in confusion or behavioural changes.

How Alzheimer’s affects the body

Alzheimer’s gradually damages brain cells that send signals to muscles and organs. This affects coordination, balance, appetite, digestion, and the ability to swallow or speak clearly.

Physical changes can appear early in the disease progression. Recognising these changes helps you prepare and maintain your loved one’s comfort and dignity.

“Alzheimer’s gradually affects coordination and spatial awareness, increasing fall risk as the condition advances. Our carers are trained to spot these subtle changes early, adjusting support to maintain mobility and independence safely at home.”

– Adebola Adeyemi, Clinical Manager (Nurse) at Hometouch

Impaired movement

Changes in walking or posture can be early physical signs of Alzheimer’s. Brain damage slows or interrupts the signals that control muscle movement. According to the Alzheimer’s Society, movement and coordination problems affect the majority of people with Alzheimer’s as the condition progresses.

A person might take shorter steps, drift to one side, or walk more slowly. Over time, they may shuffle, drag their feet, or need help standing and walking safely.

Tip: Regular gentle activity, like supported walking or physiotherapy, helps maintain strength and reduce stiffness. In our experience at Hometouch, subtle changes in gait are often the first physical sign families notice – and one of the earliest prompts to consider whether additional support at home would help.

Balance and coordination problems

Alzheimer’s affects spatial awareness and coordination, making it harder to judge distances or stay steady. The person may bump into furniture or struggle with stairs and uneven surfaces.

Balance changes increase the risk of trips and falls. Well-lit rooms, clear walkways, and supportive footwear or walking aids improve safety.

Muscle stiffness and shaking

Muscle stiffness can occur in Alzheimer’s, although it’s more commonly associated with Parkinson’s disease. Muscles may become rigid or tremble slightly, making movement difficult – a pattern that can overlap with Parkinson’s disease symptoms, particularly in later stages. The NHS notes that physical symptoms, including rigidity and tremor, become more common as the condition advances.

In later stages, muscles may tighten and waste away, making sitting or lying uncomfortable for extended periods. Carers need to reposition regularly to prevent pressure sores and maintain comfort. A specialist dementia carer will manage this as part of a structured daily routine.

Weight and appetite changes

As cognitive and coordination abilities decline, eating becomes more difficult. A person with Alzheimer’s might forget to eat, lose interest in food, or struggle with chewing and swallowing.

Dementia UK notes that weight loss and eating difficulties are among the most common physical challenges in moderate to advanced dementia. Soft meals, smaller portions, and mealtime supervision help maintain nutrition and prevent dehydration.

If swallowing difficulties develop, a speech and language therapist can provide tailored guidance. In later stages, these difficulties can contribute to aspiration pneumonia – covered in more detail in the swallowing and breathing section below.

In our experience at Hometouch, introducing a consistent mealtime routine – same time, same place, low distraction – can significantly improve food intake in the earlier and middle stages of Alzheimer’s, even when appetite has noticeably declined.

Toilet and bladder issues

Reduced mobility, low fluid intake, or poor diet can lead to constipation. Over time, bowel control may be lost. NICE guidance on dementia identifies continence management as a core component of dementia care planning, recommending early assessment and a structured toileting routine.

Urinary tract infections (UTIs) occur more frequently in people living with dementia. They can cause a sudden increase in confusion, abdominal pain, or incontinence – sometimes mistaken for a rapid decline in the condition itself. The NHS recommends prompt treatment to prevent complications and avoid unnecessary deterioration. In advanced Alzheimer’s, the brain may lose control of bladder and bowel function entirely.

Families navigating continence changes can find practical support through Hometouch’s dementia care at home service, where carers are trained to manage these needs with sensitivity and without disruption to daily routine.

Swallowing and breathing difficulties

In late-stage Alzheimer’s, the brain can lose control of muscles needed for swallowing and breathing. A person may cough or choke when eating, as food or drink enters the airway. The Alzheimer’s Society identifies swallowing difficulties as one of the defining features of late-stage dementia, affecting nutrition, hydration, and respiratory health.

This can lead to aspiration pneumonia – an infection that develops when food or liquid enters the lungs. Thickened fluids, pureed foods, and guidance from speech therapists or dietitians reduce these risks. Families considering around-the-clock support at this stage may want to explore 24-hour care at home as an alternative to hospital or residential placement.

Frequently asked questions

What are the first physical signs of Alzheimer’s disease?

The earliest physical signs are often changes in walking and posture – shorter steps, slower pace, or drifting to one side. These can appear before significant memory loss and are caused by disruption to the brain signals that control muscle movement. Balance and coordination difficulties frequently follow, increasing the risk of falls.

Can Alzheimer’s cause problems with eating and swallowing?

Yes. As Alzheimer’s progresses, a person may forget to eat, lose interest in food, or develop difficulties chewing and swallowing. In later stages, swallowing difficulties can lead to aspiration pneumonia, where food or liquid enters the lungs. A speech and language therapist can advise on safe eating strategies, including thickened fluids and modified food textures.

Why do people with Alzheimer’s get urinary tract infections?

People living with Alzheimer’s are more susceptible to UTIs due to reduced mobility, lower fluid intake, and difficulties recognising or communicating the need to use the toilet. A UTI can cause a sudden, significant increase in confusion that may be mistaken for a rapid decline in the condition. Prompt treatment is important – if you notice a sudden change in behaviour or cognition, contact a GP.

How does Alzheimer’s affect mobility in later stages?

In later stages, muscle stiffness and wasting become more pronounced, making independent movement increasingly difficult. A person may need support to stand, walk, and reposition. Regular repositioning by a carer is essential to prevent pressure sores. 24-hour care at home or live-in support is often the most appropriate option at this stage.

When should I consider live-in care for someone with Alzheimer’s?

Live-in care is worth considering when physical changes – falls, eating difficulties, or continence issues – are affecting safety and daily life, and when family carers are finding it difficult to provide consistent support. A free care assessment with the Hometouch team can help clarify what level of support is appropriate. Arrange a free assessment to talk through the options.

How can home care support the physical effects of Alzheimer’s?

Alzheimer’s progressively affects both mind and body. The physical changes covered in this article – from early shifts in gait to late-stage swallowing difficulties – are manageable with the right support in place. Early awareness and a structured care plan make a meaningful difference to comfort, safety, and quality of life at home.

Hometouch’s specialist dementia carers are matched to each person’s clinical needs and trained to recognise and respond to physical changes as they develop. Care is provided under clinical oversight, with a personalised care plan reviewed regularly as the condition progresses.

Speak to our care team about your situation – no pressure, just answers.