Fever: Signs and Symptoms, Treatment, and Prevention

Fever is one of the most common symptoms of illness and can affect people of all ages. It is the body’s natural response to infections or other conditions that affect the immune system. While fever itself is usually not dangerous, it is often a sign that something is wrong in the body. Understanding the signs and symptoms, treatment, and prevention of fever can help manage it effectively.


Fever is typically characterized by an increase in body temperature above the normal range of 98.6°F (37°C). For adults, a fever is usually considered significant when body temperature reaches 100.4°F (38°C) or higher. Here are some common signs and symptoms that accompany fever:

  • The primary sign of fever is a rise in body temperature, which can be measured using a thermometer. Depending on the cause, the fever may be mild or severe.
  • When body temperature increases, it may cause the sensation of feeling cold, leading to shivering or shaking. This is the body’s way of generating heat to raise the temperature.
  • As the body attempts to regulate its temperature, excessive sweating can occur, especially when the fever starts to break or decrease.
  • Many people experience headaches as a result of increased body temperature and dehydration that can accompany fever.
  • A general feeling of fatigue, muscle pain, and weakness is often associated with fever, particularly if the underlying cause is an infection.
  • Fever can lead to a reduced desire to eat, as the body conserves energy to fight off illness.
  • With increased sweating and elevated temperature, the body can lose fluids rapidly, leading to dehydration, which can exacerbate the symptoms of fever.
  • Young children with fever may become more fussy, restless, or lethargic. Infants may also cry more than usual.
  • Elevated body temperature can lead to a faster heart rate and increased breathing as the body attempts to cool itself down.

The treatment of fever depends on its severity and the underlying cause. Mild fevers often resolve without any specific treatment, but higher fevers or fevers accompanied by other symptoms may require intervention.

  • Stay Hydrated: Drink plenty of fluids, such as water, herbal teas, or clear broths, to prevent dehydration.
  • Rest: Resting allows the body to recover and fight off the infection causing the fever.
  • Cool Compresses: Applying a cool, damp cloth to the forehead or taking a lukewarm bath can help lower body temperature.
  • Light Clothing: Wearing lightweight, breathable clothing and using light blankets can help the body cool down without inducing chills.
  • Acetaminophen (Tylenol): This medication is commonly used to reduce fever and relieve pain. It is generally safe when taken as directed.
  • Ibuprofen (Advil, Motrin): This anti-inflammatory drug is effective in reducing fever, pain, and inflammation. It is commonly used in both children and adults.
  • Aspirin: While effective for fever in adults, aspirin should never be given to children due to the risk of Reye’s syndrome, a rare but serious condition.
  • Adults should seek medical help if their fever reaches 103°F (39.4°C) or higher or if it lasts for more than three days.
  • Children should be taken to a doctor if their fever exceeds 102°F (38.9°C), or if they experience other concerning symptoms such as a stiff neck, persistent vomiting, or unresponsiveness.
  • Infants younger than three months with a fever of 100.4°F (38°C) or higher should be seen by a healthcare provider immediately.

While fever itself cannot always be prevented, especially when it is caused by infections, there are steps you can take to reduce the likelihood of developing infections that cause fever.

  • Wash hands regularly with soap and water, especially after using the bathroom, before eating, and after coughing or sneezing.
  • Use alcohol-based hand sanitizers when soap and water are not available.
  • Stay up to date on vaccinations for preventable diseases such as the flu, measles, mumps, and other infectious diseases that can cause fever.
  • Try to avoid close contact with individuals who are ill, particularly those with contagious infections such as colds or the flu.
  • Strengthen your immune system by eating a balanced diet, exercising regularly, getting enough sleep, and managing stress.
  • In areas where mosquito-borne illnesses like malaria or dengue fever are common, use insect repellent, wear protective clothing, and sleep under mosquito nets to prevent bites.
  • Practice proper food handling and preparation techniques to avoid foodborne illnesses, which can lead to fever.

Fever is a common symptom that can indicate various underlying conditions, most often infections. It is essential to recognize the signs and symptoms of fever and understand when home treatment is appropriate versus when medical intervention is necessary. By following preventive measures such as good hygiene, vaccination, and maintaining a healthy lifestyle, you can reduce the likelihood of infections that cause fever.

If fever persists or is accompanied by severe symptoms, it is crucial to seek medical advice for proper diagnosis and treatment.

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