On its own, having a slightly higher or lower body temperature is not something to worry about. If someone has a viral infection, the body will often raise its core temperature to help fight it off. With a little rest, and plenty of food and drink, they’ll soon recover/
One thing to be wary of is dehydration. This is caused by excessive sweating as the body tries to regulate its temperature, so make sure someone showing signs of fever drinks plenty of fluids.
There is a point where high temperatures do become a cause for concern. When dealing with children over 36 months through to adults, any temperature reading over 37.7⁰C indicates a fever. And if this rises above 39.4⁰C, you should call emergency healthcare services or your local GP. Anything over 40⁰C, and the body becomes so hot that organs can begin to fail****.
In infants aged 3-36 months, the fever is indicated at 37.6⁰C, and a high fever is defined as anything over 38.5⁰C. In babies aged 0-3 months fever is diagnosed if their temperature rises to 37.4⁰C or above. Increased temperatures can be especially serious in young children and infants, as it may indicate a bacterial or viral infection. If young children or babies develop a fever, call a doctor.