Why does my sinus keep coming back every few months?

Short answer: Sinus problems that keep coming back usually have an underlying trigger, such as allergy, a deviated septum, nasal polyps, swollen turbinates, a dental infection or reduced immunity, that stops the sinuses from draining properly. Finding and treating that cause, often with a nasal endoscopy and sometimes a CT scan, is the key to breaking the cycle.

Key takeaways

• Recurrent sinusitis is usually driven by something that keeps drainage poor.
• Allergy, structural narrowing, polyps and dental infection are common causes.
• Treating each episode separately with antibiotics rarely solves the problem.
• An ENT evaluation can identify the trigger and guide longer-term control.

Dr. Prashanth's perspective

The usual triggers I find are irregularities of the nasal septum (a deviated nasal septum, or DNS), enlarged turbinates, pneumatised turbinates and nerve impingements. These are the root causes of recurrent sinus inflammation. If the root cause is not identified and solved, or at least reduced, the symptoms do not settle.

— Dr. Prashanth R. Reddy, ENT Surgeon, ENTHealth360

Why does sinusitis keep coming back?

Sinusitis returns when the sinuses cannot drain freely, so each cold or allergy flare tips them back into infection.

Healthy sinuses drain through narrow channels into the nose. A cold usually swells these channels briefly, then they reopen. If the channels are already narrow, or the lining is constantly inflamed, even a small trigger can block them again. Mucus collects, pressure builds and infection follows.

Each episode may clear with treatment, but the underlying problem remains, so the cycle repeats. Recurrent acute sinusitis usually refers to several separate episodes a year with clear periods in between.

What are the common underlying causes?

Most recurring sinus problems are linked to one or more of these triggers.

• Allergic rhinitis: allergy to dust mites, pollen, mould or pets keeps the nasal lining swollen.
• Deviated septum: the central wall of the nose is bent, narrowing one side.
• Enlarged turbinates: the ridges inside the nose that warm air become swollen and obstruct airflow.
• Nasal polyps: soft, non-cancerous swellings of the lining that block drainage.
• Dental infection: an infected upper back tooth can repeatedly seed the cheek sinus.
• Reduced immunity: diabetes, certain medicines or immune conditions may increase infections.
• Environmental irritants: smoking, second-hand smoke and air pollution.

In Bangalore, dust and pollen allergy, traffic pollution and anatomical narrowing inside the nose are common contributors.

What can you do at home to reduce flares?

Consistent daily habits can lower the number of flares for many people.

• Saline rinse once or twice a day with boiled-and-cooled, distilled or sterile water.
• Use prescribed steroid sprays regularly, not just when symptoms flare.
• Control dust at home: wash bedding weekly in hot water and reduce soft furnishings in the bedroom.
• Wear a mask on dusty commutes or during construction work nearby.
• Avoid smoking and second-hand smoke.
• Treat colds early with saline and rest.
• Keep regular dental check-ups.
• Manage diabetes and other health conditions well.

How are breathing, sleep and energy connected here?

Every sinus flare can mean several nights of poor nasal breathing and broken sleep.

During each episode, a blocked nose often forces mouth breathing at night, causing snoring, a dry mouth and frequent waking. When flares happen every few months, these disrupted nights add up. Many people describe a constant cycle of tiredness, low focus at work and missed workouts.

Breaking the cycle by treating the underlying cause may help restore steady nasal breathing, which for many people is linked to better sleep and more consistent energy across the year.

How does nose breathing support energy and BMR?

Your basal metabolic rate (BMR) is the energy your body burns at rest to keep the heart beating, the brain working and cells repairing. Your cells make that energy using oxygen, so how well you breathe matters.

Nose breathing helps in two ways:

• Warm, moist, filtered air. The nose warms, humidifies and filters each breath before it reaches the lungs. Conditioned air is gentler on the airway lining, which matters in Bangalore's air-conditioned offices and traffic dust. Mouth breathing skips this step and can leave the throat and airways dry.
• Nitric oxide from the sinuses. The paranasal sinuses continuously make nitric oxide (NO), a natural gas. When you breathe in through your nose, small amounts of this NO travel to the lungs, where studies suggest it may help widen tiny blood vessels and improve oxygen uptake. Mouth breathing largely bypasses it.

Nose breathing does not "boost" your BMR. That is set mainly by muscle mass, age, body size and hormones such as thyroid. But comfortable nasal breathing by day, and undisturbed breathing at night, support efficient oxygen supply and deeper sleep, which your body needs to use energy well and recover.

A simple check: sit quietly and breathe through your nose with your mouth closed for two minutes. If that feels difficult, or one side is always blocked, it is worth having your nose examined.

When should you see an ENT?

See an ENT if sinus infections are frequent or keep needing antibiotics.

• Three or four sinus infections a year.
• Needing antibiotics for sinus problems every few months.
• Symptoms between episodes, such as constant blockage or reduced smell.
• One-sided symptoms, or flares after dental work.
• Seek urgent medical care for swelling or redness around the eyes, double or reduced vision, severe headache with a stiff neck, confusion, high fever or forehead swelling.

How an ENT evaluates and treats it

An ENT looks for the reason behind the cycle rather than treating each episode alone.

Evaluation starts with a detailed history and a nasal endoscopy to look at the septum, turbinates, sinus openings and any polyps. A CT scan may be advised to map the sinuses and their drainage pathways. Allergy testing may be suggested if allergy is suspected, and a dental review if a tooth source is possible. Blood tests may be advised in selected cases.

Treatment depends on the cause. It may include allergy control, regular steroid sprays and saline rinses. In selected cases, a minimally invasive endoscopic procedure may be considered to open the drainage pathways or correct a deviated septum or enlarged turbinates. The right option depends on the cause.

Frequently asked questions

Does nose breathing give me more energy? It does not add energy by itself, but it delivers warm, humidified air and sinus nitric oxide to the lungs, which may help oxygen uptake. Together with better sleep, that supports the energy your body uses at rest (BMR) and during activity.

How many sinus infections a year is too many? Three or four or more episodes a year, or needing repeated antibiotics, is a common reason to see an ENT and look for an underlying cause.

Can allergy alone cause repeated sinusitis? Yes. Ongoing allergic swelling can block sinus drainage. Controlling the allergy often reduces flares.

Will a procedure stop my sinus infections completely? A procedure may reduce how often infections happen for many people, but it is not a promise of no future episodes. Ongoing care usually still helps.

References

• Lundberg JO, Farkas-Szallasi T, Weitzberg E, et al. High nitric oxide production in human paranasal sinuses. Nature Medicine. 1995;1(4):370-373.
• Lundberg JO, Settergren G, Gelinder S, et al. Inhalation of nasally derived nitric oxide modulates pulmonary function in humans. Acta Physiologica Scandinavica. 1996;158(4):343-347.
• Keck T, Leiacker R, Heinrich A, Kühnemann S, Rettinger G. Humidity and temperature profile in the nasal cavity. Rhinology. 2000;38(4):167-171.

About the author

Dr. Prashanth R Reddy is an ENT surgeon at ENTHealth360, Bangalore (MS ENT; MBA, IIM Bangalore; Seoul Rhinoplasty Fellowship), seeing patients at Sakra World Hospital, Marathahalli and in Koramangala. His practice focuses on how breathing affects sleep, energy and everyday performance.

Related reading: Sinusitis: Causes, Symptoms, Home Care & When You Need an ENT (Bangalore Guide)

For educational purposes only. Not a substitute for medical advice. Please consult a qualified ENT specialist.