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Influenza symptoms usually begin suddenly 1–4 days after exposure and commonly include fever, cough, sore throat, muscle pain, headache, and fatigue.
Influenza (flu) typically causes a sudden onset of symptoms that are often more severe than a common cold. The incubation period is usually 1–4 days (most commonly 1–2 days). Common early symptoms include fever, chills, headache, muscle pain, malaise, loss of appetite, low energy, and sometimes confusion. Respiratory symptoms commonly accompany these, especially a dry cough (the most common symptom), sore or dry throat, hoarse voice, and a stuffy or runny nose. Gastrointestinal symptoms such as nausea, vomiting, and diarrhea can occur, particularly in children. Symptoms usually last about 2–8 days, and many infections are mild and limited to the upper respiratory tract. However, influenza can progress to pneumonia, either from the initial viral infection (primary viral pneumonia) or from a secondary bacterial infection (secondary bacterial pneumonia). Primary pneumonia often shows rapid worsening of fever and cough with labored breathing and low oxygen levels, while secondary pneumonia may involve a period of improvement followed by recurrent fever, sputum production, and fluid buildup in the lungs. Influenza can also lead to serious complications such as acute respiratory distress syndrome (ARDS), meningitis, encephalitis, and worsening of existing conditions like asthma and cardiovascular disease.
Influenza symptoms usually begin suddenly 1–4 days after exposure and commonly include fever, cough, sore throat, muscle pain, headache, and fatigue.
Symptoms typically last 2–8 days, but influenza can progress to pneumonia (viral or secondary bacterial) and other severe complications, especially in high-risk groups.
The time between exposure to influenza virus and the development of symptoms, typically 1–4 days.
Pneumonia caused by the initial viral influenza infection, often with rapid worsening of fever, cough, breathing difficulty, and low oxygen.
Pneumonia that occurs after initial improvement, due to a secondary bacterial infection following influenza.
A severe lung complication that can occur with influenza, causing profound breathing difficulty and low oxygen.
A term used for influenza-related symptoms that may persist longer than the typical illness duration, similar in concept to long COVID.
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