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Health Information Center


  • Cynthia M. Johnson, MA
Publication Type:



(Sinus Infection; Acute Sinusitis; Chronic Sinusitis; Rhinosinusitis)


Sinusitis is inflammation of the air-filled spaces in the skull called sinus cavities. It may be:

  • Acute—lasts for less than 4 weeks
  • Subacute —lasts 4 to 12 weeks
  • Chronic—lasts more than 3 months
  • Recurrent—returning episodes of acute sinusitis
Sinus Infection.

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Acute sinusitis is often caused by an infection. It may be viral, bacterial, or fungal (rare). Chronic sinusitis may happen in people who are at higher risk of infection. It may also be due to irritation from contaminants in the air like smoking, pollution, or allergens.

Risk Factors

Factors that may increase the chance of sinusitis are:

  • Recent viral infection
  • Smoking or exposure to secondhand smoke
  • Other sources of indoor or outdoor air pollution
  • Allergies or asthma
  • Head injury or a health problem requiring a tube to be inserted into the nose
  • Cocaine and other drugs inhaled through the nose

Problems with structures around the face may increase the risk of sinusitis. Examples are:

Chronic illnesses that increase risk of sinusitis are:


Sinusitis may cause:

  • Facial congestion or fullness
  • Facial pain or pressure that increases when you bend over or press on the area
  • Headache
  • Cough, which is often worse at night
  • Nasal congestion that does not ease with decongestants or antihistamines
  • Runny nose or postnasal drip
  • Thick, yellow, or green mucus
  • Bad breath
  • Ear pain, pressure, or fullness
  • Fever
  • Fatigue
  • Dental pain
  • Symptoms seem to improve then suddenly get worse over a few weeks


The doctor will ask about symptoms and past health. A physical exam will be done. The doctor can diagnose sinusitis based on its symptoms and an exam. More tests may be done if sinusitis is not responding to treatment or keeps coming back.


Most sinus infections will pass on their own in 7 to 10 days. Home care and medicine can help to manage symptoms.

Infections that last longer or keep coming back may need more care.


To lower the risk of sinusitis:

  • Take steps to prevent allergies, such as avoiding triggers and following any care plan in place
  • Wash hands often
  • Avoid smoking and being around secondhand smoke
  • Manage chronic health problems

Supportive Care

Sinus pressure and pain may be eased by:

  • Drinking plenty of water
  • Using nasal and sinus washes
  • Using a humidifier or inhaling steam from bowl of hot water




  • Acute rhinosinusitis in adults. EBSCO DynaMed website. Available at: https://www.dynamed.com/condition/acute-rhinosinusitis-in-adults.
  • Acute rhinosinusitis in children. EBSCO DynaMed website. Available at: https://www.dynamed.com/condition/acute-rhinosinusitis-in-children.
  • Chronic rhinosinusitis. EBSCO DynaMed website. Available at: https://www.dynamed.com/condition/chronic-rhinosinusitis.
  • Sinusitis. American Academy of Otolaryngology—Head and Neck Surgery website. Available at: https://www.enthealth.org/conditions/sinusitis.


  • David L. Horn, MD, FACP
Last Updated:

This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.