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Everything You Need to Know About The Sinuses

By ActiveBeat Author

The sinuses are a network of hollow cavities at the front of the skull, around the nose, cheekbones, and forehead. These cavities connect to the nasal airways and are part of the body’s respiratory system.

Human sinuses have a variety of functions, which are discussed later in this article. We also explore some common sinus problems and when you should speak to your doctor.

What Are the Sinuses?

Sinuses come in pairs, or paired groups, and are positioned symmetrically on the skull. The different types of sinuses are:

  • Frontal Sinuses: Cavities in the forehead, just above each eye.
  • Maxillary Sinuses: The two largest sinuses. They sit just behind the cheekbones.
  • Sphenoid Sinuses: Located near the option nerve and the pituitary gland.
  • Ethmoid Sinuses: A cluster of small air cells rather than a single air-filled cavity. Located in the bone between the brain and the nasal cavity.

The edges of the sinus cavities are lined with delicate tissue and a thin layer of mucus. The mucus is designed to catch bacteria, particles, and other foreign invaders that enter when we breathe.

Mucus in the sinuses drains into the nose via a narrow drainage tube called the middle meatus. From there, it is directed into the back of the throat by small hair cells called cilia. Mucus is swallowed with saliva, allowing potentially harmful bacteria to be destroyed by your stomach acid.

Sinus Function

Your sinuses are an intricate network of hollow passages that form part of the upper respiratory system. The primary purpose of the sinuses is to facilitate air flow and drainage of mucus.

Other functions of the sinuses include:

  • Serving as tiny echo-chambers to help your voice resonate when you speak
  • Acting like cushions to protect your face and brain from trauma
  • Providing insulating pockets that prevent sudden temperature changes in the nasal passages
  • Helping to humidify the air we breathe

What Is Sinusitis?

Sinus problems can be extremely painful and have a detrimental effect on your overall health.

Sinusitis is the most common sinus problem in the United States. According to the Center for Disease Control and Prevention, there are currently around 28.9 million people suffering with sinusitis. In 2018, severe cases of sinusitis resulted in a staggering 234,000 emergency room visits across the country.

Sinusitis is an infection of the sinuses. Also known as rhinosinusitis, this infection may begin in the sinuses or may be the result of an upper respiratory tract infection which has spread to this area of the skull.

The typical symptoms of a sinusitis are:

  • Pain or pressure in the head
  • The feeling of having a blocked nose
  • Excess mucus, which may be thick or discolored
  • Tenderness around the cheeks and nose

Less common symptoms of sinusitis include:

  • Fever
  • Tiredness
  • Bad breath
  • Limited sense of smell or taste

Sinusitis can either be:

  • Acute: Usually short-lived. Will last a few weeks at worst.
  • Chronic: Can last for several months at a time. Often occurs three or four times in a 12-month period.
ANDREI ASKIRKA / Shutterstock

What to Do if You Have Sinusitis

Acute sinusitis symptoms can be improved by inhaling steam. You can do this at home by filling a bowl with boiling water and breathing in the steam directly from the bowl, with a towel, or cloth over the back of your head. There are also several over-the-counter medications you can pick up from your pharmacist, which may help to ease headaches or congestion.

If it is severe and frequently recurring, chronic sinusitis may warrant medical treatment. Your doctor might recommend allergy treatments, immunotherapy, or corticosteroids to reduce inflammation. When frequent bacterial infections are the cause of the sinusitis, taking antibiotics may be beneficial.

Other Common Sinus Problems

Besides sinusitis, there are a few other common and highly treatable conditions which could affect airflow through the sinuses. These include:

Nasal Polyps

Nasal polyps are soft growths that form on the inside of the nasal passage and sinuses. They are usually a result of prolonged inflammation.

While nasal polyps are not cancerous, your doctor may recommend getting them removed if they cause discomfort or breathing problems.

Deviated Septum

The septum is the dividing barrier between the sinuses and nasal passages. A healthy septum is roughly central. If the septum is significantly off center, this is referred to as a “deviated septum”.

People who have a deviated septum may suffer from:

  • Frequent sinus infections
  • Nosebleeds
  • A feeling of being congested in one or both nostrils


Though it is extremely rare, cancerous growths can develop in the sinuses or nasal passages. This type of cancer is more common among people who smoked, worked with toxic chemicals, or infected with HPV. Nasal cancer’s earliest symptoms may be similar to those of a serious infection.

When to See a Doctor About Your Sinuses

Mild sinusitis can usually be managed with home remedies and over-the-counter medications. However, there are some instances in which you should book an appointment with your doctor to make sure there is nothing more serious than sinusitis causing your symptoms. For instance, it is advisable to get checked out by your general practitioner if you have painful sinus symptoms that are unusual or last for longer than one week.

It would be wise to seek an immediate consultation or visit the emergency room if you develop any of the following symptoms:

  • Difficulty breathing
  • Rapidly worsening symptoms
  • Blurred or reduced vision
  • Discomfort moving your eyes
  • Noticeable swelling around the eyes or cheekbones
  • A severe headache which is not improved by painkillers
  • An extremely high fever
  • Difficulty turning or tilting your head

Some of these symptoms could indicate the presence of a cancerous growth. While this is unlikely to be the case if you are also suffering with a fever, it could mean you are suffering with a serious infection which requires medical treatment. If in doubt, it is always better to get checked out.

ActiveBeat Author


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