Symptoms of dehydration in older adults

An older person may not feel strong thirst even while losing fluid. Mobility problems, memory changes, swallowing difficulty, dependence on carers, fever, vomiting or diarrhoea can make drinking harder. Medicines that increase urination may also affect fluid balance. A new change in alertness, behaviour or steadiness deserves attention because it may reflect dehydration or another illness, including infection.

Look at the person’s usual pattern rather than one isolated sign. Darker urine, passing urine less often, dry lips, constipation and reduced energy together are more concerning than a minor change alone. Cloudy urine, pain during urination or fever should not be assumed to be dehydration.

Offer small drinks regularly and keep a preferred drink within easy reach, unless a clinician has prescribed fluid restriction. Include fluid-rich foods when appropriate. Record what is being taken if intake is difficult, and provide help with cups, positioning or swallowing as needed. Do not stop prescribed medicines or give salt-containing products without professional advice. During vomiting or diarrhoea, ask a clinician about oral rehydration options.

Get urgent help for new confusion, fainting, inability to drink, repeated vomiting, severe weakness, very little urine, collapse or difficulty waking. Contact a clinician promptly for a sudden decline, persistent dizziness, fever, painful urination, blood in urine or symptoms that do not improve with supported drinking.

Ask about a suitable daily fluid plan, warning signs for this person, medicine effects, swallowing support and whether urine or blood tests are needed.