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NEET UG 2026 » NEET UG Study Material » Biology » Sinusitis
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Sinusitis

Sinusitis is an inflammatory condition in which the tissue lining the sinuses becomes inflamed or swollen. The Sinuses are the group of four paired cavities (spaces) in the human skull. These are connected through a network of thin channels. The Sinuses produce a thin mucus that drains through a nasal canal. This drainage assists in keeping the nose clean and bacteria-free.

Table of Content
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Types of sinuses near the nose and eyes

Paranasal sinuses are the group of sinuses that are found in the back side of the head near the nose and the eyes. They are so named because the bones that support their structure are named after them.

  • Frontal sinuses, located above the eyes.
  • Maxillary sinuses, located below the eyes
  • Ethmoidal sinuses, located between the eyes.
  • Sphenoidal sinuses, located behind the eyes.

Maxillary cavity is one of the largest of the sinus cavities, and it is also the cavity that is most frequently infected with bacteria.

Sinusitis can manifest itself in the following ways:

  • Acute bacterial sinusitis: Cold symptoms like stuffy nose, facial pain and runny nose that appear suddenly and persist for more than 10 days are referred to as “sudden onset of cold symptoms.”  The Symptoms that show improvement but then return and become worse than that of the initial symptoms are said to be “double sickening.” Antibiotics and decongestants are effective treatments for such conditions.
  • Chronic sinusitis: Symptoms of this ailment include nasal congestion, discharge, facial pain/pressure, and a diminished sense of smell that lasts for at least 12 weeks after the onset of the condition.
  • Subacute sinusitis: When the symptoms last between four and twelve weeks, this phrase is used.
  • Recurrent acute sinusitis: Symptoms that return four or more times in one year and last less than two weeks each time are referred to as recurrences.

Symptoms

Following are the Common signs and symptoms of sinusitis include:

  • The Post nasal drip (the mucus drips down the throat).
  • Nasal discharge (green discharge or thick yellow from nose) or stuffy nose
  • Facial pressure (particularly around the eye, nose, and forehead), headache and or the pain in the ear or teeth.
  • Halitosis (bad breath)
  • Cough.
  • Tiredness.
  • Fever.

Causes of Sinusitis

Sinusitis can be caused by a virus, bacteria, or fungus that causes the sinuses to enlarge and get blocked. Some examples of specific causes are:

  • Common cold is a contagious illness.
  • Allergies to mould and pollen, as well as nasal and seasonal allergies
  • Polyps are a type of growth (growths).
  • A septum that is deviated. The septum is a line of cartilage that separates the two halves of your nose. A deviated septum is one in which the septum is not straight, causing it to be closer to the nasal passage on one side of your nose than the other, resulting in an obstruction.
  • The compromised immune system due to sickness or drugs.

The use of pacifiers or drinking bottles while lying down may increase the likelihood of developing sinusitis in newborns and young children who attend day care.

Smoking raises the likelihood of developing sinus infections in adults. If you are a smoking person, you must give it up. Cigarette smoking is detrimental to both the smoker and those around him or her.

Preventing of Sinusitis

Some of the home remedies that are used to treat the symptoms of sinus infections may also be used to avoid sinusitis. There are several options, including washing your nose with salt water and utilising drugs that your provider may recommend, such as allergy meds or steroid nasal sprays.

You should avoid items that make you sick, such as dust, pollen, or smoking, and you should avoid individuals who are sick as well. Hand washing can help minimize your chances of contracting a cold or the flu.

Diagnosis

It is likely that your healthcare professional will ask you a slew of questions in order to compile a comprehensive medical history and learn about your symptoms. Moreover, they will do some physical examinations. During the exam, your health-care provider will examine your ears, nose, and throat for signs of edema, drainage, or blockage, among other things. It may be necessary to examine the inside of the nose with an endoscope (a small lighted/optical device). In some situations, you may be sent to an ENT expert, which stands for ear, nose, and throat. If your doctor determined that you needed an imaging exam, he or she would arrange a computed tomography (CT) scan.

Treatment

Sinusitis can be treated in a variety of methods, each of which is determined by how serious the case of sinusitis is.

A mild sinusitis infection is treated with the following medications:

  • Decongestants.
  • Cold and allergy treatments that are available over-the-counter.
  • Nasal irrigation with saline solution.
  • Drinking enough of fluids (sinusitis is a viral infection and fluids will help).

If your sinusitis symptoms do not improve after 10 days, your doctor may prescribe the following medications:

  • Antibiotics are drugs that are used to treat infections (for seven days in adults and 10 days in children).
  • Decongestants can be taken orally or applied topically.
  • Intranasal steroid sprays available only by prescription. (Nonprescription sprays or drops should not be used for more than three to five days at a time because they may actually worsen congestion.

Long-term (chronic) sinusitis may be treated by addressing the underlying cause of the infection (typically allergies). This is typically addressed using the following:

  • Intranasal steroid sprays are available.
  • Topical antihistamine sprays or oral antihistamine pills are both options.
  • Swelling and allergy symptoms can be reduced with leukotriene antagonists.
  • Rinsing the nose with saline solutions that may also contain various forms of medication is another option.

It is necessary to utilize a CT scan to get a better look at your sinuses if your sinusitis is not managed by one of the treatments listed above. Depending on the results of your tests, surgery to fix structural abnormalities in your sinuses may be required. If you have polyps and/or a fungal infection, you are more prone to experience this problem.

CONCLUSION

Sinusitis is an inflammation and swelling of the tissue lining of the sinuses. It is caused by bacteria or viruses. The sinuses are four cavities (spaces) in the skull that are associated with one another. They are linked together by a network of small channels. The sinuses produce thin mucus, which drains out of the nasal passages into the channels. In addition to keeping the nose clean and free of bacteria, this discharge also helps to reduce nasal congestion. The sinuses, which are normally filled with air, can become obstructed and filled with fluid. Bacteria can flourish in such an environment and produce an infection (bacterial sinusitis).

This condition is also referred to as rhinosinusitis, with the prefix “rhino” denoting “nose.” When the sinuses become inflamed, the nasal tissue nearly invariably becomes swollen.

faq

Frequently asked questions

Get answers to the most common queries related to the NEET UG Examination Preparation.

What are the 4 types of sinuses?

There are four paranasal sinuses, each named for the bone from which it derives its name: the maxillary, ethmoid, sp...Read full

What bacteria causes sinusitis?

The bacteria Streptococcus pneumoniae is one of the most prevalent types of bacteria that cause bacterial sinusitis....Read full

Which sinus is most commonly infected and why?

The maxillary cavity is the largest sinus cavity, and it is one of the cavities that is most frequently infected....Read full

What type of virus causes sinusitis?

Rhinoviruses, influenza viruses, and parainfluenza viruses 

Who is at risk for sinusitis?

Hay fever or another type of allergic reaction affecting the sinuses. Sinusitis is a common cold that affects the si...Read full

There are four paranasal sinuses, each named for the bone from which it derives its name: the maxillary, ethmoid, sphenoid, and frontal sinuses. The maxillary sinus is the largest of the four sinuses. Additionally, the dura of the brain contains sinuses, which include the superior sagittal, straight, and sigmoid, among others.

The bacteria Streptococcus pneumoniae is one of the most prevalent types of bacteria that cause bacterial sinusitis. Haemophilus influenzae is a kind of bacteria. Staphylococcus aureus is a kind of bacteria.

The maxillary cavity is the largest sinus cavity, and it is one of the cavities that is most frequently infected.

Rhinoviruses, influenza viruses, and parainfluenza viruses 

Hay fever or another type of allergic reaction affecting the sinuses. Sinusitis is a common cold that affects the sinuses. An abnormality of the nasal passages, such as a deviated septum, nasal polyps, or tumours. Cystic fibrosis is a medical illness, while HIV/AIDS is an immune system disorder.

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