Emergency services are urging people to take extra care during the latest spell of hot weather.
The Welsh Ambulance Service and South Wales Fire and Rescue Service have issued warnings following a surge in demand during last month’s heatwave.
The Welsh Ambulance Service reported an increase of more than 400 emergency calls daily and is reminding the public to only dial 999 in a genuine, life-threatening emergency.
Darren Panniers, head of service at Welsh Ambulance, said: "We have seen that warmer weather increases demand and can contribute to incidents such as falls through dehydration, dizziness, low blood pressure, fatigue and reduced mobility.
"People should look out for the warning signs of dehydration, which include confusion or altered behaviour, weakness, excessive tiredness, headaches and reduced appetite.
"Early recognition and intervention is important and simple steps such as providing cold drinks, ice lollies and foods with high water content can make a significant difference in preventing dehydration."
The public is encouraged to use alternatives to 999 where appropriate.
The NHS 111 Wales website and its digital assistant, Albot, can offer guidance and help people access the most suitable care.
The services also warned of risks associated with open water, after reports of people getting into difficulty.
Gavin Murphy, station manager at South Wales Fire and Rescue Service, said: "We want people to enjoy the warm weather, but we are urging everyone to take care around open water.
"Rivers, lakes, reservoirs, quarries and canals can look calm and inviting, but they can be cold, deep and unpredictable.
"Warm weather does not mean warm water, and cold water can affect your breathing and swimming ability very quickly.
"This is not about stopping people enjoying themselves, it is about helping them enjoy the warm weather safely."
