Daily Water Needs: How Hydration Supports Healthy Blood Pressure

Drinking water does more than quench thirst and replace fluids lost throughout the day. It also supports essential body functions, including circulation and the regulation of blood pressure.

Adequate hydration helps maintain the fluid volume needed for blood to circulate. When the body loses more water than it takes in, blood volume can fall, potentially causing low blood pressure and dizziness.

There is no single daily amount that suits everyone. Water needs vary with activity levels, weather, diet and health, while fluids from food and other drinks also contribute to overall hydration.

Drinking regularly throughout the day and paying attention to thirst can help people meet their needs. More fluid may be needed during hot weather or exercise, when sweating increases water loss.

Staying hydrated is not a substitute for blood pressure medication or medical advice. People with heart or kidney conditions, or those prescribed a fluid restriction, should follow their clinician’s guidance on how much to drink.