Fever: Common Causes and the Tests That Find Them

Fever is a temporary increase in your body temperature, often due to an illness. It is a common symptom that can be caused by a variety of factors, ranging from infections to inflammatory conditions. Understanding the potential causes and the tests to diagnose them can help you manage your health effectively.

What is Fever?

Fever is defined as a body temperature that is higher than normal. The average normal body temperature is around 98.6°F (37°C), but it can vary slightly from person to person. A fever is generally considered to be a body temperature of 100.4°F (38°C) or higher. It is a sign that your body is fighting an infection or inflammation.

Common Causes of Fever

Fever can be caused by various factors, including:

• Infections: Bacterial, viral, or fungal infections are the most common causes of fever. These can include illnesses like the flu, pneumonia, or urinary tract infections.
• Inflammatory Conditions: Conditions such as rheumatoid arthritis or lupus can cause fever as part of the inflammatory process.
• Heat Exhaustion: Prolonged exposure to high temperatures can lead to heat exhaustion, resulting in fever.
• Medications: Some drugs, including antibiotics and antihistamines, can cause fever as a side effect.
• Vaccinations: Fever can occur after receiving a vaccine as your body builds immunity.

Tests to Diagnose the Cause of Fever

When you have a fever, especially if it persists, your healthcare provider may recommend certain tests to determine the underlying cause:

• Blood Tests: Complete blood count (CBC) can help identify infections or inflammatory conditions by measuring different components of your blood.
• Urine Tests: Urinalysis can detect infections in the urinary tract.
• Imaging Tests: X-rays or CT scans may be used to look for signs of infection or inflammation in the body.
• Cultures: Blood, urine, or throat cultures can identify specific bacteria or viruses causing the infection.

Frequently Asked Questions

What should I do if I have a fever? If you have a fever, it's important to rest, stay hydrated, and monitor your symptoms. Over-the-counter medications like acetaminophen or ibuprofen can help lower your temperature.

How long do fevers usually last? Fevers from common infections typically last a few days to a week. If your fever persists longer, consult a healthcare provider.

Can stress cause a fever? While stress itself doesn't cause fever, it can weaken your immune system, making you more susceptible to infections that can cause fever.

Is it safe to exercise with a fever? It's generally advised to avoid strenuous exercise when you have a fever, as it can further increase your body temperature and lead to dehydration.

Can a fever be a sign of COVID-19? Yes, fever is a common symptom of COVID-19, along with cough and difficulty breathing. If you suspect COVID-19, follow local health guidelines and consider getting tested.

When to See a Doctor

While most fevers are not serious and can be managed at home, you should see a doctor if:

• The fever lasts more than three days.
• Your fever is very high (above 103°F or 39.4°C).
• You experience severe symptoms like difficulty breathing, chest pain, or confusion.
• You have underlying health conditions that could be worsened by a fever.

Always remember that the decision to seek medical attention should be made in consultation with your healthcare provider.

Decisions about your health should always be made in consultation with your healthcare provider.