A sinus infection (sinusitis) can last anywhere from about a week to several months, depending on the type and what’s causing it.

Typical timelines

  • Viral acute sinus infection
    • Often starts as a cold.
    • Symptoms usually improve within 5–10 days, and most are gone by about 2 weeks.
  • Bacterial acute sinus infection
    • Often follows a viral infection that doesn’t get better.
    • Can last 7–10 days or more, sometimes up to 4 weeks, especially if antibiotics are needed.
  • Subacute sinusitis
    • Symptoms last 4–12 weeks.
  • Chronic sinusitis
    • Symptoms persist 12 weeks or longer , and may wax and wane over months or even years.
  • Recurrent sinusitis
    • Several separate infections in one year (commonly 4 or more), with symptom‑free periods in between.

When to worry and see a doctor

You should contact a doctor or urgent care if you have:

  • Sinus symptoms lasting more than 10 days with no improvement, or getting worse after initially improving.
  • High fever, severe facial pain, swelling around eyes, vision changes, or stiff neck.
  • Very frequent sinus infections, or symptoms lasting longer than 12 weeks.
  • Underlying conditions like asthma, immune problems, or you feel unusually short of breath or very unwell.

Home care vs medical treatment

  • Often helpful at home: saline rinses, humidifier, warm compresses, plenty of fluids, pain relievers, and nasal steroid sprays if advised by a clinician.
  • Antibiotics are only useful for bacterial infections, not for typical viral colds.

A common story: someone catches a cold, feels stuffed up and miserable for about a week, then slowly improves over the next 5–7 days. That’s a typical viral sinus infection course. If instead they feel worse in week two, with new fever and facial pain, a doctor might diagnose bacterial sinusitis and treat it, which can stretch the total illness to 2–4 weeks.

Mini FAQ

How long does a sinus infection last without antibiotics?
Often 7–10 days, sometimes up to about 3–4 weeks, if it’s viral or a mild bacterial case your body can clear on its own.

How long before I should be concerned?
If you’re not improving at all after 7–10 days, or still quite unwell after 2 weeks, it’s reasonable to see a clinician for an exam.

Information gathered from public forums or data available on the internet and portrayed here.