Q: Can acute sinusitis after the flu cause a mild fever?

Medically reviewed by Sang Hyun Ahn, MD

This post is a dramatization of a question and answer session experienced by our actual medical reviewers. Please note that this content is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.

Question:

I caught the flu last Saturday. Last night, my forehead felt warm, and I developed a mild fever. I went to the doctor this morning and was diagnosed with acute sinusitis, with severe inflammation in my nasal passages. I also have a cough. I had a chest X-ray on Tuesday, which ruled out pneumonia. Can sinusitis cause a fever? My nose is extremely stuffy right now.

Answer:

Yes, being diagnosed with acute sinusitis after the flu is quite common, and sinusitis can definitely cause a mild fever.

Sinusitis and Fever

It is very common to experience a mild fever (37.5°C - 38°C) when inflammation and fluid fill the sinuses (the hollow spaces around your nose). This frequently occurs as a secondary bacterial infection when your immune system is temporarily weakened after fighting off the flu.

Current Management Tips

• Make sure to finish the entire course of your prescribed antibiotics, even if you start feeling better.

• Drink plenty of warm water and caffeine-free tea.

• Use a humidifier or safely inhale warm steam to help open your nasal passages.

• Rinse your nasal passages with a saline solution 2 to 3 times a day.

• Get plenty of rest to help your body recover.

When to Revisit the Doctor

Seek an in-person medical evaluation if you experience any of the following:

• Your fever rises above 38.5°C or lasts for more than 3 days.

• You develop swelling or severe pain on one side of your face.

• You experience any visual disturbances or a severe headache.

• There is absolutely no improvement in your symptoms after 48 hours of taking antibiotics.

Acute sinusitis is a frequent complication following the flu. With proper antibiotic treatment, symptoms usually begin to improve within 3 to 5 days. Continue to manage your symptoms at home with the prescribed treatments, but please follow up with your doctor if your condition persists or worsens.

For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.

https://fevercoach.us