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How to Check Fever Without a Thermometer

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Fever occurs when the body temperature rises above the average temperature (between 36.7 and 37.8 degrees Celsius). [1] Fevers are often associated with a variety of illnesses, and depending on the cause of the fever, it can be a sign of a benign or serious illness. The most accurate way to measure body temperature is with a thermometer. However, without a thermometer, you still have some ways to read your symptoms to know if you need an emergency.

Check for fever symptoms

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Image titled Check a Fever Without a Thermometer Step 1

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Touch the patient’s forehead or neck. The most common way to check for a fever without a thermometer is to touch the patient’s forehead or neck to see if it is hotter than usual. [2]

  • Use the back of your hand, as the skin on the palm is not as sensitive as other areas of the skin.
  • Do not touch your hands or feet to check your temperature because these parts can be cold even though your body temperature is high.
  • Remember that this is the first step in figuring out what’s wrong, but it’s impossible to know exactly if the sick person has a dangerously high fever. Sometimes an infected person’s skin is cold and moist when they have a high fever, and sometimes conversely, the skin is very hot even though there is no fever.
  • Be sure to check the patient’s skin temperature in a room that’s not too hot or cold, and not after they’ve sweated from exercise.
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Image titled Check a Fever Without a Thermometer Step 2

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Observe the patient’s skin for redness. A fever sometimes causes the skin on a person’s cheeks and face to turn red. However, this is difficult to recognize if the patient has a dark complexion. [3]
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Image titled Check a Fever Without a Thermometer Step 3

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Know if the patient is lethargic. Fever is often accompanied by lethargy or exhaustion, such as slow movements or speech or refusal to get out of bed. [4]

  • Children with a fever may complain of being tired or weak, not going out to play, or losing their appetite.
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Image titled Check a Fever Without a Thermometer Step 4

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Ask the patient if they are in pain. Muscle and joint pain is sometimes accompanied by fever.

  • Headaches are also common with fever.
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Image titled Check a Fever Without a Thermometer Step 5

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Check to see if the patient is dehydrated. When a patient has a fever, it is very easy to become dehydrated. Ask if they are thirsty or if their mouth feels dry.

  • Dark yellow urine is a sign that they are dehydrated and may have a fever. Darker-than-normal urine also signals more severe dehydration.
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Image titled Check a Fever Without a Thermometer Step 6

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Ask the patient if they are nauseous. Nausea is an important symptom of fever or other illnesses such as the flu. Notice if the person is nauseous, vomiting, or unable to keep food from coming up.
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Image titled Check a Fever Without a Thermometer Step 7

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Note if the patient is shaking or sweating. When the body temperature is erratic, the person often shivers and feels cold, even though other people in the room feel comfortable. [5]

  • The patient will feel hot and cold due to fever. When the body temperature fluctuates, the patient will shiver even though the people around him still feel normal.
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Image titled Check a Fever Without a Thermometer Step 8

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Treat a febrile convulsion lasting more than 3 minutes. A febrile seizure is a seizure that occurs before or while a child has a high fever. If the fever is higher than 39.4 degrees Celsius, the child may have hallucinations. [6] One in 20 children under the age of 5 has a febrile seizure at some point. Although you may panic when you see your child having a seizure, the condition does not cause permanent damage to the child. Treat febrile seizures as follows: [7]

  • Place the child on his or her side in an open space or on the floor.
  • Do not try to hold the baby and do not put anything in the child’s mouth during the seizure, do not be afraid that the child will swallow his tongue!
  • Stay with the child for 1-2 minutes after the seizure stops.
  • Place the child on his or her side in the recovery position during the recovery period.

Severity rating

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Image titled Check a Fever Without a Thermometer Step 9

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Seek immediate medical attention if your child’s febrile seizure lasts longer than 3 minutes. This condition could be a sign of a more serious condition. Call 911 and keep the infant in the resuscitation position. [8] You should also seek emergency medical attention if a febrile seizure is accompanied by: [9]

  • Vomit
  • Stiff neck
  • Shortness of breath
  • Extremely sleepy
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Image titled Check a Fever Without a Thermometer Step 10

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Call the doctor if your child’s symptoms do not improve or get worse. If your child is 6-12 months old and has a fever of 38.9 degrees Celsius or higher, call your doctor right away. If your baby is under 3 months old and has a fever above 38 degrees Celsius, you should also call your doctor. [10] Give your child plenty of water to drink and coax her to try to lie down. [11]
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Image titled Check a Fever Without a Thermometer Step 11

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Seek medical attention if sick person presents with severe abdominal pain, chest pain, difficulty swallowing, and stiff neck. These symptoms could be symptoms of meningitis, a highly contagious and life-threatening disease. [12] [13]
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Image titled Check a Fever Without a Thermometer Step 12

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Call your doctor if the person is agitated, confused, or has hallucinations. These symptoms could signal a bacterial or viral infection, such as pneumonia. [14]
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Image titled Check a Fever Without a Thermometer Step 13

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Seek medical attention if there is blood in stool, urine, or mucus. These are signs of a more serious infection. [15]
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Image titled Check a Fever Without a Thermometer Step 14

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Seek medical attention if the person’s immune system is already weakened by another illness such as cancer or AIDS. A fever can be a sign that their immune system is under attack, complications, or other illnesses. [16]
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Image titled Check a Fever Without a Thermometer Step 15

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Talk to your doctor about other serious medical conditions that can cause fever. Fever can be caused by many different diseases. Ask your doctor if a fever could be a sign of any of the following conditions:

  • Virus disease
  • Infectious disease
  • Heat exhaustion or sunburn
  • Arthritis
  • A malignant tumor
  • Antibiotics or blood pressure medication
  • Vaccines against diseases such as diphtheria, tetanus and pertussis

Treat fever at home

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Image titled Check a Fever Without a Thermometer Step 16

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Treat fever at home if the fever is below 39.5 degrees Celsius and the patient is over 18 years old. A fever is the body’s way of trying to heal or recover, and most fevers go away on their own after a few days.

  • You can reduce your fever with proper treatment.
  • Drink plenty of fluids and rest. You don’t have to take medicine, but it can make you more comfortable. Take an over-the-counter fever reducer such as aspirin or ibuprofen. [17]
  • Call your doctor if symptoms persist for more than 3 days and/or get worse.
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    Image titled Check a Fever Without a Thermometer Step 17

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    Treat fever by giving your child plenty of fluids and rest if he or she is not showing severe symptoms. Children and adolescents should not take aspirin because it has been linked to Reyes’ disease. [18]

    • If your child has a fever below 38.9 degrees Celsius, you can also treat them at home.
    • See your doctor if fever persists for more than 3 days and/or symptoms get worse.

    • Advice

    • Note that the most accurate way to check your temperature for a fever at home is to use a thermometer. The most accurate places to take temperature are in the anus and under the tongue, or use an ear thermometer. Underarm temperature measurement is often inaccurate. [19]
    • See a doctor if your baby is under 3 months old and has a fever above 37.8 degrees Celsius.

    Warning

    • Don’t rely on the “check the temperature with the back of your hand” method. Although this is the usual way to distinguish body temperature, placing a hand on the forehead does not determine the temperature involved. Furthermore, this method is not accurate if the person testing you has a different average body temperature than you. [20]

    Fever occurs when the body temperature rises above the average temperature (between 36.7 and 37.8 degrees Celsius). [1] Fevers are often associated with a variety of illnesses, and depending on the cause of the fever, it can be a sign of a benign or serious illness. The most accurate way to measure body temperature is with a thermometer. However, without a thermometer, you still have some ways to read your symptoms to know if you need an emergency.

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