A fever is a common symptom of COVID-19, generally defined as a body temperature above 38 °C (100.4 °F). It represents the body’s natural response to an infection, as the immune system works to fight off the virus. While many people infected with the SARS-CoV-2 virus experience a fever, its intensity and duration can vary significantly among individuals.
Typical Fever Duration
For many, a COVID-19 fever returns to normal within 3 to 4 days. However, some individuals may experience a fever that lasts longer, extending up to 7 to 10 days.
Fever often appears as an early symptom of COVID-19 and typically peaks within the initial days before gradually subsiding. The fever itself can be mild to moderate, and it might even come and go rather than being constant. Not everyone who contracts COVID-19 will develop a fever. While adults frequently experience fever, children are less likely to have a high temperature and often present with milder symptoms overall.
Factors Influencing Fever Duration
Several elements can influence how long a fever lasts during a COVID-19 infection. Vaccination status plays a role, as vaccinated individuals often experience fewer and less severe symptoms, with a quicker resolution of illness.
The specific COVID-19 variant circulating can also affect symptom presentation and duration. For instance, earlier variants like Delta were associated with high fevers, whereas more recent Omicron subvariants may result in milder, cold-like symptoms. An individual’s unique immune response is another factor. A robust immune system can help clear the virus more quickly, potentially shortening the duration of fever.
Age significantly impacts fever duration and disease severity. Older adults and infants younger than six months face a higher risk of severe illness, which can include prolonged symptoms. Additionally, underlying health conditions, such as heart disease, diabetes, chronic lung conditions, or obesity, can increase the likelihood of more severe disease and a longer period of fever.
When to Consult a Doctor
While most fevers with COVID-19 resolve without severe complications, there are specific situations where medical attention is advised. You should consult a healthcare professional if your fever does not break after a few days or if it persists beyond 5 to 7 days. This is especially important if the fever is accompanied by worsening symptoms.
Immediate medical help should be sought if you experience any emergency warning signs. These include trouble breathing or shortness of breath, persistent pain or pressure in the chest, new confusion, or an inability to wake or stay awake. Bluish discoloration of the lips, face, or nail beds also indicates a need for urgent care. Individuals who are at higher risk for severe illness, such as infants, the elderly, or those with compromised immune systems, should contact their doctor for any concerning fever.