A fever is when your core temperature is raised above 38°C. It often accompanies an infection, such as a cold or flu. Show
This page provides general information about fever. If you have a child with a fever, see fever in children. Normal body temperature for children and adults is around 37ºC (degrees Celsius). A fever is when your core body temperature is higher than 38ºC (degrees Celsius). Usually, you will feel unwell and hot, and you may sweat. Sometimes you will feel very cold and shivery even when your temperature is high. Mild fever: You have a mild fever if your temperature is between 38ºC and 38.9ºC. You can use a thermometer to find out how high your temperature is. Read more about thermometers and how to use them.
Looking after yourself when you have a feverA fever usually lasts 3–5 days and most people recover from a mild fever by managing their symptoms at home. However, there are times when you should see a doctor urgently for fever.
When to seek helpAlthough most fevers will settle down in a few days and are not worrying, you sometimes need to seek medical advice.
What causes fever?A viral infection is the most common cause of a fever. A bacterial infection is less common but is more serious. Your body's natural reaction to infection is to raise your body temperature. This helps kill the infection. Vaccination sometimes causes a mild fever too. Do I need medicine for fever?Fever is your body’s way of fighting infection. Medicine is not needed for mild fever, but you can use paracetamol if you also have a headache or muscle pain. Learn moreFever in adults Ministry of Health,
NZ References
See also Clinicians page on fever in children. Information for healthcare providersFever and night sweats Patient Info Professional, UK, 2016 Reviewed by
How long should you wait to take your temperature after drinking something cold?Oral temperature
If you've been eating or drinking, wait 30 minutes before you take a temperature by mouth. Turn on the digital thermometer. Place the thermometer tip under your tongue. Close your mouth around the thermometer for the recommended amount of time or until the thermometer beep indicates it's done.
How should the healthcare provider take the temperature of an adult client who just had oral surgery?Recent consumption of a hot drink or cold drink alters a client's oral temperature. Thus, temperature is taken via the axillary or tympanic route if a client has recently had a hot or cold drink. You can take an oral temperature if you wait 15 minutes after hot drink consumption.
How long should the nurse leave the thermometer in checking the temperature via oral route?Oral method (in the mouth). Carefully place the tip of the thermometer under your child's tongue.. With your child's mouth closed, leave the thermometer in place for about 1 minute until you hear the “beep”. Remove the thermometer and read the temperature.. Does eating affect oral temperature?1 Eating and Smoking
The oral temperature measurement increases about 0.3°C after sustained chewing and stays elevated for up to 20 minutes, probably because of increased blood flow to the muscles of mastication.
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