Dehydration in older people: signs, symptoms and prevention

Dehydration is one of the most common – and most preventable – health concerns in later life. As a family member or carer, knowing the signs to look for and how to help your loved one stay hydrated can make a real difference to their health and wellbeing.

Our bodies are made up of around 60% water. Drinking enough keeps temperature regulated, gets nutrients to cells, keeps joints lubricated, and helps the kidneys and other organs function properly. Even mild dehydration can affect concentration, mood, energy levels, and physical coordination.

Why are older people more at risk of dehydration?

Older people are more vulnerable to dehydration for several reasons. The sensation of thirst becomes less reliable with age, which means your loved one may not feel thirsty even when their body needs fluids. At the same time, the kidneys become less efficient at conserving water.

Certain health conditions common in later life, including dementia, diabetes, and kidney disease, can increase the risk further. Some medications, including diuretics, laxatives, and certain blood pressure drugs, also cause the body to lose more fluid. Hot weather, illness, vomiting, and diarrhoea can all accelerate fluid loss, making careful monitoring especially important in summer months. Our guide to summer safety tips for older people covers what else to look out for during a heatwave.

Signs of dehydration in older people

The NHS lists the following as common signs of dehydration to watch for:

• Feeling thirsty
• Dark yellow, strong-smelling urine
• Urinating less frequently than usual
• Dizziness or light-headedness
• Tiredness
• Dry mouth, lips or eyes
• Headache

Keep in mind that your loved one may not mention feeling thirsty – especially if they live with dementia or another condition that affects communication. Checking the colour of their urine (pale straw is ideal) and whether they seem more tired or confused than usual can be useful early indicators.

Signs of severe dehydration

If your loved one shows any of the following signs, call their GP or 111 as soon as possible. According to NHS Inform, signs of severe dehydration include:

• Extreme thirst
• Little or no urination
• Dark, strong-smelling urine
• Feeling dizzy when standing up
• Rapid heartbeat
• Rapid breathing
• Sunken eyes
• Confusion
• Drowsiness or loss of consciousness
• A weak pulse
• Cold hands and feet

These are serious warning signs. Don't wait to see if things improve on their own – get medical advice promptly.

Can dehydration cause confusion in older people?

Yes. Confusion and disorientation are common symptoms of dehydration in older people, and can be mistaken for other conditions. If your loved one seems suddenly more confused, drowsy, or unlike themselves, dehydration is worth considering, particularly in hot weather or if they haven't been drinking well. Contact their GP or call 111 if you're concerned.

How to check for dehydration at home

Two simple checks can help you assess whether your loved one may be dehydrated:

Urine colour

Pale, straw-coloured urine is a good sign that fluid intake is adequate. Dark yellow or amber urine usually indicates dehydration. If your loved one has difficulty monitoring this themselves, it may be worth checking if possible.

The skin turgor test

Gently pinch the skin on the back of your loved one's hand, hold it for a couple of seconds, then release. Normally the skin springs back quickly. If it returns slowly or stays tented, this can be a sign of dehydration. Note that this test is less reliable in older people – skin loses elasticity with age – so treat it as one indicator alongside others. The NHS recommends speaking to a GP if you're concerned.

How to help your loved one stay hydrated

The NHS recommends a minimum of six to eight glasses of fluid a day. Here are some practical ways to help your loved one reach that:

Encourage regular drinks throughout the day

• Always keep a drink within easy reach – your loved one should not need to get up or ask in order to have a drink nearby.
• Build drinks into their daily routine: a glass of water at mealtimes, a cup of tea mid-morning, a cold drink in the afternoon.
• If they forget to drink or seem reluctant, gentle reminders and drinking together can help make it feel more natural.

Make drinking easier

• Use a cup that's easy to hold and doesn't spill – adaptive cups and lids can make a real difference for someone with limited grip or coordination.
• For someone living with dementia, a brightly coloured cup placed at eye level can help draw their attention to it.
• Offer a variety of drinks – water, squash, herbal tea, warm milk. Your loved one is more likely to drink something they enjoy.

Include water-rich foods

• Soups, broths, and stews are a good way to add fluid, particularly if your loved one eats small portions.
• High-water-content fruits and vegetables – such as cucumber, melon, oranges, and celery – also contribute to daily fluid intake.
• Jelly Drops (fruit-flavoured treats made of 95% water with electrolytes and vitamins) can be a helpful option for people living with dementia who resist drinking.

Be mindful of certain drinks

Caffeinated drinks like tea, coffee, and cola have a mild diuretic effect and can contribute to dehydration if drunk in large quantities. Alcohol is also dehydrating. This doesn't mean they need to be cut out entirely, but balancing them with plenty of water is a good habit. The British Heart Foundation has guidance on drinks and heart health that may also be relevant if your loved one has a heart condition.

Watch for medication that affects fluid levels

If your loved one takes medication that affects fluid intake or causes more frequent urination – such as diuretics or certain blood pressure medications – speak to their GP about how best to manage hydration. Don't stop or reduce medication without medical advice.

When to seek medical help

Contact a GP or call 111 if your loved one:

• Has not urinated for eight hours or more
• Has a rapid heartbeat or rapid breathing
• Seems confused, drowsy, or unusually difficult to rouse
• Shows signs of severe dehydration listed above

Call 999 if your loved one loses consciousness, has a seizure, or shows signs of serious deterioration. Do not wait.

How Elder can help

If you're concerned about a loved one's hydration or general health and wellbeing at home, a self-employed live-in carer introduced through Elder may be able to help. A carer can monitor fluid intake throughout the day, prepare nourishing meals and drinks, manage medications, and notice early signs of dehydration before they become serious.

Find out more about live-in care with Elder, or get in touch to talk through your options.

Sources

• NHS: Dehydration
• NHS Inform: Dehydration symptoms
• NHS: Water, drinks and hydration
• NHS: Hot weather advice
• British Heart Foundation: Drinks and heart health
• Alzheimer's Society: Eating and drinking with dementia