The summer flu is a viral respiratory infection, similar to the flu. While the flu virus is most active from fall to winter, it can spread year-round. Summer flu-like symptoms may stem from other illnesses.
However, it’s possible to catch the flu in the summer. The risk is higher in countries with opposite flu seasons, like Australia. In tropical areas, the flu circulates all year.
Since COVID-19, flu patterns have become unpredictable in their patterns worldwide. For instance, in 2022-2023, the flu started early in the global south and the U.S., while Mexico saw cases in May.
What are the Symptoms of Summer Flu?
Flu symptoms typically appear 2–3 days after infection. Common symptoms include:
- Fever
- Chills
- Coughing or sneezing
- Headaches
- Muscle aches
- Runny or congested nose
- Sore throat
The flu tends to manifest suddenly, sometimes within hours. Other illnesses with similar symptoms may develop more gradually, such as:
- Bronchitis
- COVID-19
- Common cold (rhinovirus)
- Human metapneumovirus (hMPV)
- Mononucleosis (mono)
- Parainfluenza
- Pneumonia
- Respiratory syncytial virus (RSV)
- Strep throat
How is the Summer Flu Treated?
Treatment for summer flu is similar to other viral infections. Prescription antivirals work best when taken within 48 hours of the first symptoms. For most, rest, hydration, and good nutrition are key to recovery.
Additional tips include:
- Use nasal irrigation or decongestants
- Rest as much as possible
- Take supplements like zinc and vitamin C
- Gargle saltwater to soothe a sore throat
- Use over-the-counter remedies for flu and pain
- Eat bland, easy-to-digest foods if nauseous
- Take probiotics to aid recovery
- Use a humidifier or steam for breathing difficulties
How Long Does Summer Flu Last?
Flu symptoms typically last 3 to 7 days, and the infection usually clears within two weeks. It’s most contagious in the first few days but can still spread up to a week after recovery.
Under certain conditions, influenza symptom intensity and duration can differ. With an influenza vaccine, symptoms can be shorter and less intense. Those with weaker immune systems may feel ill from the flu for longer and experience complications, especially:
- Infants and toddlers
- People aged 65 and older
- Those with chronic conditions (asthma, heart disease, HIV, diabetes)
- Pregnant individuals
- People with a BMI of 40 or higher
How to Tell the Difference Between Summer Flu and Covid-19
COVID-19 and influenza can be difficult to differentiate. Both can induce fever, chills, cough, shortness of breath, headaches, and vomiting. If you experience flu-like symptoms during the summer, it’s wise to get tested.
There are some clear distinctions. COVID-19 symptoms often appear later and last longer. It can take up to two weeks for symptoms to show, and the illness can be more severe or fatal. COVID-19 may also cause unique symptoms like loss of taste or smell, eye swelling, or skin rashes.
The Bottom Line
Summer flu is a viral infection like the flu seen in colder months. Flu-like symptoms in summer could also indicate other illnesses. They appear within a few days, and include fever, chills, coughing, and body aches.
Treatment includes rest, hydration, over-the-counter remedies, and antivirals, especially if taken early. Vulnerable groups may experience longer and more severe symptoms. Testing is crucial to determine cause of illness and receive appropriate treatment.
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Logan Hamilton is a freelance writer for hire. He’s passionate about crafting crystal-clear, captivating, and credible content that elevates brands and establishes trust. When not writing, Logan can be found hiking, sticking his nose in bizarre books, or playing drums in a local rock band. Find him at loganjameshamilton.com.
