Hydration

Hydration means having enough water in the body for normal function. Fluid needs vary with age, activity, weather, pregnancy, illness and medical conditions. Water is a usual everyday choice, but there is no single drinking target that suits everyone. People with prescribed fluid restrictions need individual advice.

How can I tell whether I am drinking enough?

Thirst, urine output and urine colour can offer clues, but no single sign is a complete assessment. Heat, vomiting, diarrhoea and exercise can increase fluid loss. Older people and those who depend on others for drinks may need extra attention to regular access.

Some foods and medicines alter urine colour. Do not use a colour chart to dismiss significant symptoms or assume that clear urine means more water is always better. Excessive intake can also be unsafe in some circumstances.

For the Australian guidance behind this explanation, see Healthdirect Australia: Drinking water and your health - Healthdirect Australia.

What should I do during illness or heat?

Drink regularly in amounts you can tolerate and seek advice if you are losing substantial fluid. A pharmacist or clinician can advise on suitable replacement during vomiting or diarrhoea. Babies and children need age-appropriate guidance rather than an adult plan.

If you have kidney, heart or liver disease, ask whether your usual fluid advice changes when unwell. Do not independently abandon a prescribed restriction or force large volumes. Plan access to water and cool conditions during hot weather, especially when working outdoors or caring for someone vulnerable.

When should I seek help?

Inability to keep fluids down, very little urine, worsening dizziness or significant weakness needs prompt assessment. Confusion, collapse or serious breathing changes can indicate severe illness; call 000 for life-threatening symptoms.

See Doccio's online doctor service for suitable routine advice, and the dehydration entry for warning signs. Telehealth can help with triage, but severe dehydration or another acute illness requires in-person assessment rather than a general hydration target.

Where to go next

Read online doctor consultations to understand the relevant service. A doctor decides whether a consultation, examination, referral or another pathway is appropriate for your situation.