NHS Lanarkshire have issued an urgent appeal to the public asking them not to attend A&E unless it is “life threatening”.
The health board revealed on Saturday that they are currently at capacity and “anyone who attends will face a long wait”.
It comes as an amber warning was issued by the Met Office for extreme heat on Friday, stating that the skyrocketing temperatures could last into next week.
The warning covers southern parts of Scotland from midnight on Monday, July 18 until 11.59pm on Tuesday, July 19.
Advice has been issued by the Government that includes staying hydrated and drinking plenty of fluids.
The appeal read: “Our Emergency Departments remain at capacity, meaning anyone who attends will unfortunately face a long wait.
“If you need us but your condition is not life-threatening please consider calling NHS 24 on 111 or visit nhsinform.scot for healthcare information.
“We want to get you the right care you need, in the right place.
“Please know that verbally or physically aggressive behaviour towards our staff won’t be tolerated.”