Chronic Sinusitis: Symptoms, Causes and When to See an ENT

Living with chronic sinusitis is like carrying an invisible weight that affects every aspect of your day. Constant congestion, facial pressure, fatigue... these symptoms can turn the simplest activities into real challenges. In my ENT practice in Marbella and Málaga, I regularly see patients who have normalised these symptoms for years, unaware that a solution exists.

Understanding the paranasal sinuses

To understand chronic sinusitis, we first need to know what the paranasal sinuses are. They are air-filled cavities located in the bones of the skull, around the nose and eyes. We have four pairs: the frontal sinuses in the forehead, the maxillary sinuses in the cheeks, the ethmoidal sinuses between the eyes and nose, and the sphenoidal sinuses deep within the skull. These cavities are not simply empty spaces. They are lined with a specialised mucosa that produces mucus and are connected to the nasal passages through small channels called ostia. Under normal conditions, mucus flows continuously from the sinuses into the nose, carrying away particles, bacteria and other elements that must be eliminated. This drainage system is essential to keeping the sinuses healthy. The paranasal sinuses serve several important functions. They filter and condition the air we breathe, humidifying and warming it. They help lighten the weight of the skull, making our head lighter than it would be if these bones were solid. They also act as resonance chambers that give our voice its unique characteristics, and they protect delicate structures of the brain and eyes by acting as cushioning zones against facial trauma.

Chronic sinusitis: a complex problem

Chronic sinusitis is defined as inflammation of the paranasal sinuses that persists for more than twelve weeks despite medical treatment. Unlike acute sinusitis, which is usually the result of a cold or viral infection and resolves within a few weeks, chronic sinusitis is a persistent inflammatory process that requires a different approach. The cardinal symptom is persistent nasal congestion. Patients describe a constant blocked-nose sensation that does not improve significantly with nasal decongestants. This obstruction may be bilateral or affect one side more than the other, and it often worsens at night or when lying down. Thick nasal discharge is another characteristic symptom. The mucus may be clear, but when there is a bacterial component it turns yellowish or greenish. Many patients also experience post-nasal drip, that sensation of mucus running down the back of the throat, which can trigger coughing, particularly at night, and throat irritation. Facial pain and pressure are especially frustrating. Patients describe a sensation of pressure or heaviness in the cheeks, forehead or between the eyes. This pain can intensify when bending over, on exertion, or simply with changes in altitude or atmospheric pressure. One of the symptoms with the greatest impact on quality of life is loss of smell (hyposmia or anosmia). The sense of smell is closely linked to taste, so its loss also affects the ability to enjoy food. Many patients do not realise how diminished their sense of smell is until it is restored after treatment. Secondary symptoms, although less specific, contribute significantly to the discomfort. Frontal or generalised headache, chronic fatigue that does not improve with rest, bad breath caused by chronic sinus infection, dental pain in the upper arch and a persistent cough, especially at night — all of these symptoms gradually wear down the patient's quality of life.

The causes: a multifactorial puzzle

Chronic sinusitis rarely has a single cause. Rather, it is the result of multiple factors that interact with one another. Understanding these factors is fundamental to successful treatment. Anatomical factors play a crucial role. A deviated nasal septum can obstruct the sinus ostia, preventing proper drainage. Nasal polyps, benign growths of the nasal mucosa, can completely block airflow and sinus drainage. Turbinate hypertrophy, congenital narrowing of the sinus channels, or anatomical variations such as a concha bullosa (when a middle turbinate contains air) can predispose to recurrent sinusitis. Environmental and allergic factors are equally important. Allergic rhinitis causes chronic inflammation of the nasal and sinus mucosa, creating an environment prone to infection. Exposure to environmental pollutants, tobacco smoke (active or passive), very dry or very humid climates, and certain workplace irritants can perpetuate sinus inflammation. There are also systemic medical factors that favour chronic sinusitis. Asthma and chronic sinusitis frequently coexist in what we call "unified airway disease". Gastroesophageal reflux can irritate the nasal and sinus mucosa, particularly laryngopharyngeal reflux. Immunodeficiencies, whether congenital or acquired, reduce the body's ability to fight infection. Fungal infections, although less common, can cause chronic sinusitis that is especially resistant to treatment.

The diagnostic process: beyond the symptoms

Diagnosing chronic sinusitis is a meticulous process that goes far beyond listening to symptoms. It begins with a detailed medical history in which we explore not only the duration and characteristics of the symptoms, but also triggering factors, previous treatments and their effectiveness, environmental and occupational exposures, a history of allergies, and coexisting medical conditions. The physical examination includes a detailed inspection of the nasal cavity. We look for signs of inflammation, discharge, polyps or septal deviation. We palpate the sinus regions for pain or tenderness. We examine the throat for signs of post-nasal drip. Nasal endoscopy is a fundamental tool in my practice. Using a thin, flexible endoscope with a camera, I can directly visualise the inside of the nasal passages and the drainage openings of the sinuses. This allows me to identify polyps, deviations, mucosal inflammation, secretions and obstructions that are not visible on a simple examination. When the clinical findings suggest chronic sinusitis, I request a CT scan of the paranasal sinuses. This imaging test is the gold standard for assessing the extent of sinus disease. It shows us exactly which sinuses are affected, the degree of obstruction, the presence of polyps, and any anatomical variation that may be contributing to the problem. In selected cases, allergy testing is essential. If I suspect that an allergic component is perpetuating the inflammation, I refer the patient for complete allergy studies. Identifying and treating the underlying allergies can be key to long-term control of sinusitis.

Treatment: a stepwise approach

Treatment of chronic sinusitis follows a stepwise approach, always beginning with conservative measures and progressing to more invasive options only when necessary. Medical treatment is the first line. Topical nasal corticosteroids are the cornerstone of treatment, reducing inflammation of the sinus and nasal mucosa. Nasal irrigation with saline or hypertonic saline solutions helps mechanically clean the nasal passages and sinuses, removing thick mucus, crusts and allergens. When there is evidence of bacterial infection, we prescribe antibiotics, usually prolonged courses of 3-4 weeks. If there is an allergic component, antihistamines and allergen immunotherapy can be very beneficial. It is important to understand that medical treatment of chronic sinusitis usually requires months of continued therapy. It is not a condition that is cured with a week of antibiotics. It requires patient commitment and close follow-up. When maximum medical treatment over at least three months does not provide sufficient relief, we consider endoscopic sinus surgery (ESS). This technique revolutionised the treatment of chronic sinusitis. Through the nasal passages, without external incisions, we use endoscopes and specialised instruments to open the obstructed sinus ostia, remove polyps, correct septal deviations and restore normal sinus ventilation and drainage. The advantages of endoscopic surgery are numerous. Being minimally invasive, it leaves no visible scars. Recovery is relatively quick, with most patients returning to their activities within 1-2 weeks. Direct visualisation with the endoscope allows a precision that was impossible with older techniques. And the results, in experienced hands and with the right patient, are excellent in terms of improved quality of life. However, it is crucial to understand that surgery is not a magic cure. It is a tool to restore sinus anatomy and drainage, but postoperative medical treatment remains necessary to maintain results in the long term.

When to seek help: warning signs

Many people tolerate nasal symptoms for years before seeking specialist help. It is important to know when it is time to consult an ENT specialist. You should seek specialist evaluation if you experience symptoms that persist for more than three months despite basic medical treatment. Recurrent sinusitis, defined as three or more episodes per year, warrants investigation to identify underlying causes. A lack of response to antibiotics or treatments prescribed by your family doctor is a clear sign that you need specialist evaluation. Certain symptoms require urgent attention. Complete loss of smell, although not an emergency, significantly impacts quality of life and may indicate severe disease. Intense or persistent facial pain, especially if it is one-sided, requires investigation. Any visual involvement, such as double vision, loss of vision or swelling around the eyes, is a medical emergency that requires immediate attention, as it may indicate spread of the infection to the orbit.

Prevention: the best treatment

Although we cannot always prevent chronic sinusitis, especially when there are predisposing anatomical or immunological factors, there are measures that can significantly reduce the risk. Maintaining good nasal hygiene with regular saline irrigation is one of the most effective measures. This helps keep the mucosa hydrated and removes allergens, bacteria and thick mucus before they cause problems. Adequate control of allergies is essential in allergic patients. This may include avoiding known allergens, using anti-allergy medication and, in selected cases, immunotherapy. Avoiding tobacco, both active and passive, is crucial. Tobacco smoke paralyses the cilia that move mucus and causes chronic inflammation of the mucosa. Staying well hydrated helps make mucus less thick so it drains better. Properly treating acute respiratory infections, rather than leaving them untreated, can prevent their progression to chronic sinusitis.

Living without sinusitis is possible

Chronic sinusitis is not a life sentence. With the correct diagnosis, appropriate treatment and proper follow-up, the vast majority of patients experience significant improvement or complete resolution of their symptoms. I have seen patients who had suffered for years, resigned to living with congestion, pain and loss of smell, completely recover their quality of life after appropriate treatment. The satisfaction of seeing a patient breathe freely for the first time in years, or regain their ability to smell and taste, is one of the greatest rewards of my speciality. If you have spent months or years with nasal congestion, facial pain, loss of smell or any of the other symptoms we have discussed, do not resign yourself to living with it. A specialist ENT evaluation can identify the causes of your problem and offer you effective solutions. Life is too valuable to spend it unable to breathe freely.