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Clinical emergency room medical reference guide at Memorial Springs ER in Spring TX
Nov 09, 20263 min read

Are Sinus Infections Contagious?

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Woman with a tired expression holds a tissue to her nose against an olive green background

Facial pressure, a stuffy nose, and thick mucus can make a sinus infection miserable. And if you live with family or work closely with others, you may be wondering: Are sinus infections contagious? The answer depends on what caused the infection. A sinus infection itself does not spread from person to person, but the viruses that often trigger it can.

Most sinus infections clear up with home care, and our guide on how to treat a sinus infection explains the steps. However, rare complications can be serious. If you have a severe headache, swelling around your eyes, or a high fever and need the closest emergency room, Memorial Springs ER in Spring, TX, is open 24/7.

What Is a Sinus Infection?

A sinus infection, also called sinusitis, happens when the lining of your sinuses becomes inflamed and swollen. Your sinuses are air-filled spaces behind your forehead, cheeks, and eyes. When they swell, mucus cannot drain properly, leading to pressure, congestion, and sometimes infection.

According to the CDC, sinus infections are usually caused by viruses and often get better on their own without antibiotics.

How Each Type of Sinus Infection Spreads

Here is how it breaks down by cause:

  • Viral sinus infections: the viruses that cause them, such as cold or flu viruses, are contagious. You can pass the virus to others, but they may only get a cold rather than a sinus infection.
  • Bacterial sinus infections: generally not contagious. They often develop when mucus gets trapped, and bacteria grow.
  • Fungal sinus infections: rare and not contagious.
  • Allergy-related sinusitis: not contagious, since it is caused by allergens such as pollen or dust.

If your sinus symptoms started with a cold, you are most contagious in the first few days, usually before and during your worst cold symptoms.

Common Sinus Infection Symptoms

  • Facial pain or pressure around the eyes, cheeks, or forehead.
  • Stuffy or runny nose.
  • Thick yellow or green mucus.
  • Postnasal drip and sore throat.
  • Reduced sense of smell.
  • Headache.
  • Cough, often worse at night.
  • Bad breath.
  • Tooth pain in the upper jaw.
  • Fatigue and sometimes fever.

How Long Does a Sinus Infection Last?

  • Acute sinusitis: lasts less than 4 weeks. Most viral cases improve within 7 to 10 days.
  • Subacute sinusitis: lasts 4 to 12 weeks.
  • Chronic sinusitis: lasts 12 weeks or longer, even with treatment.
  • Recurrent sinusitis: several episodes within a year.

Viral or Bacterial: How to Tell the Difference

It can be hard to tell on your own. A bacterial infection is more likely if:

  • Symptoms last more than 10 days without improving.
  • You start to feel better, then suddenly get worse again.
  • You have a high fever with thick, colored mucus and facial pain for 3 to 4 days in a row.

Mucus color alone does not tell you whether an infection is bacterial. Your doctor may use an exam, and sometimes lab services or imaging, to decide whether antibiotics are needed.

How to Relieve Sinus Infection Symptoms at Home

  • Saline nasal rinse: flushes out mucus and allergens.
  • Warm compress: eases pressure when placed over your face.
  • Steam: loosens mucus when you breathe it in from a hot shower or a bowl of hot water.
  • Fluids: keep mucus thin.
  • Rest: helps your immune system recover.
  • Over-the-counter medicine: pain relievers, decongestants, and nasal steroid sprays can ease symptoms, but do not use decongestant sprays for more than 3 days.
  • Sleeping with your head raised: helps your sinuses drain.

How to Avoid Spreading Germs

  • Wash your hands often.
  • Cover your coughs and sneezes.
  • Do not share cups, utensils, or towels.
  • Stay home if you have a fever.
  • Get your yearly flu vaccine.

When to Go to the ER

Sinus infections are rarely dangerous, but in some cases the infection can spread to the eyes or brain. Call 911 or go to the ER right away if you have:

  • Swelling or redness around one or both eyes.
  • Vision changes, including double vision.
  • A severe headache or stiff neck.
  • Confusion or extreme drowsiness.
  • A high fever that does not improve.
  • Swelling of the forehead.

Care When Sinus Symptoms Turn Serious

Most sinus infections are more uncomfortable than dangerous, but warning signs like eye swelling, a severe headache, or confusion should not wait. Memorial Springs ER in Spring, TX, cares for patients across Spring, Klein, Tomball, The Woodlands, and North Houston with board-certified physicians and short wait times.

Our Spring emergency room never closes, so you can be seen at any hour. If an infection may be spreading to the eyes or brain, quick care matters. In a life-threatening emergency, call 911 right away.

Frequently Asked Questions

Can I Go to Work With a Sinus Infection?

If you have a fever or cold symptoms, stay home to avoid spreading the virus. Once your fever is gone and you feel well enough, you can usually return.

Do I Need Antibiotics for a Sinus Infection?

Most sinus infections are viral and do not need antibiotics. Your doctor may prescribe them if a bacterial infection is likely.

Can a Sinus Infection Spread to Your Lungs?

Not usually. However, postnasal drip can irritate your throat and airways and cause a cough, and the virus behind a sinus infection can also cause bronchitis.

Can Kids Get Sinus Infections?

Yes. Children can get sinus infections, often after a cold. See a doctor if symptoms last more than 10 days or your child has a high fever.