Allergy & Asthma Specialist Serving Arizona
Sinusitis (Sinus Infection)
Comprehensive Diagnosis and Personalized Sinus Care
A sinus infection occurs when the nasal cavities become swollen and inflamed, blocking normal mucus drainage and creating the conditions for bacteria, viruses, or fungi to grow. At Carefree Allergy in North Phoenix, we help identify what’s driving your sinus infections and build a treatment plan focused on long-term relief, not just short-term symptom management.
What Are Sinuses?
Your sinuses are four pairs of air-filled cavities located within the bones of your face and skull. They are lined with a thin layer of mucus that traps dust, germs, and other airborne particles. Tiny hair-like structures called cilia sweep that mucus, along with whatever it has captured, toward the back of the throat, where it is naturally cleared from the body.
When the sinus lining becomes inflamed, this drainage system breaks down. Mucus gets trapped, pressure builds, and bacteria or other pathogens can begin to grow inside the blocked cavities. That is what we call a sinus infection, or sinusitis.
The sinuses are located:
- Within the cheekbones (maxillary sinuses)
- Behind the forehead and eyebrows (frontal sinuses)
- On either side of the bridge of the nose (ethmoid sinuses)
- Behind the nose, near the base of the skull (sphenoid sinuses)
Types of Sinusitis
Sinusitis is classified based on how long symptoms last and what is causing them.
Acute Sinusitis
Symptoms develop suddenly and typically resolve within four weeks. Most cases are triggered by a viral upper respiratory infection, such as the common cold.
Subacute Sinusitis
Symptoms persist between four and twelve weeks, often following an acute infection that did not fully clear.
Chronic Sinusitis
Symptoms last twelve weeks or longer despite treatment. Chronic sinusitis is often linked to allergies, structural nasal issues, or recurring bacterial infections.
Recurrent Acute Sinusitis
Four or more sinus infection episodes per year, each lasting fewer than two weeks. This pattern often points to an underlying trigger, such as allergies, that needs to be addressed.
Bacterial vs. Viral Sinusitis
Most sinus infections start with a virus. Bacterial sinusitis tends to develop when symptoms don't improve after ten days, or when they seem to get better and then suddenly worsen. Unlike viral infections, bacterial sinusitis often requires antibiotics to fully resolve.
"For most of her childhood, Lindsey believed the problem was her."
For Lindsey Forstie, FNP, asthma care is deeply personal. As someone who grew up with undiagnosed asthma, she understands how easily breathing limitations can be misinterpreted as lack of endurance, motivation, or effort. That lived experience shapes how she listens, evaluates symptoms, and approaches treatment today.
At Carefree Allergy, asthma care focuses on identifying triggers and building a long term management plan that fits your life. We provide comprehensive asthma evaluation and ongoing care for patients across Arizona, with in office visits in Phoenix and telehealth follow ups available statewide.
What Are the Symptoms of a Sinus Infection?
Facial pain or pressure (especially under the eyes and around the nose)
Nasal congestion or stuffiness
Thick, discolored nasal discharge (yellow or green)
Reduced or lost sense of smell
Cough, often worse at night
Bad breath and tooth or jaw pain
Common flu symptoms such as headache, fatigue
Risk Factors
Anyone can develop a sinus infection, but certain factors increase the likelihood of recurrent or chronic sinusitis:
- Allergies
Nasal inflammation from allergic rhinitis can block sinus drainage pathways
- Asthma
Closely linked to chronic sinus inflammation
- Frequent upper respiratory infections
Repeated colds create repeated opportunities for secondary sinus infections
- Structural issues
A deviated septum, nasal polyps, or narrow sinus openings can trap mucus
- Weakened immune system
Increases susceptibility to bacterial and fungal infection
- Environmental exposure
Smoke, air pollution, and dry climates (like Arizona) can irritate the nasal passages and sinuses
- Family history of allergies or asthma
How It's Tested and Treated
A thorough sinus infection evaluation includes a review of your symptoms, how long they have been present, and how often they recur. For patients with chronic or recurrent sinusitis, allergy testing is often an important step. Identifying environmental triggers, like dust mites, mold, or pollen, can explain why sinus infections keep coming back and help guide a more effective treatment plan.
Treatment For Acute Sinus Infections:
- Saline nasal rinses to flush the sinuses
- Decongestants and pain relievers for symptom relief
- Intranasal corticosteroids to reduce inflammation
- Antibiotics when bacterial infection is confirmed or strongly suspected
Treatment For Chronic or Recurrent Sinusitis:
- Allergy testing to identify environmental triggers
- Personalized allergy treatment, including sublingual immunotherapy (allergy drops), to reduce the underlying immune response driving recurring inflammation
- Long-term intranasal corticosteroid therapy
- Referral for structural evaluation when appropriate
Types of Sinusitis
How It’s Tested and Treated
A thorough sinus infection evaluation includes a review of your symptoms, how long they have been present, and how often they recur. For patients with chronic or recurrent sinusitis, allergy testing is often an important step. Identifying environmental triggers, like dust mites, mold, or pollen, can explain why sinus infections keep coming back and help guide a more effective treatment plan.
Treatment For Acute Sinus Infections:
- Saline nasal rinses to flush the sinuses
- Decongestants and pain relievers for symptom relief
- Intranasal corticosteroids to reduce inflammation
- Antibiotics when bacterial infection is confirmed or strongly suspected
Treatment For Chronic or Recurrent Sinusitis:
- Allergy testing to identify environmental triggers
- Personalized allergy treatment, including sublingual immunotherapy (allergy drops), to reduce the underlying immune response driving recurring inflammation
- Long-term intranasal corticosteroid therapy
- Referral for structural evaluation when appropriate
Tired of sinus infections that keep coming back?
If you have had two or more sinus infections in the past year, or if your symptoms have lasted more than a few weeks, it may be time to look deeper. At Carefree Allergy, we offer comprehensive allergy testing and personalized treatment plans, including at-home allergy drops, designed to address the underlying causes of chronic sinus inflammation.
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Common Questions
How long does a sinus infection last?
An acute sinus infection typically lasts one to two weeks. If symptoms persist beyond ten days without improvement, or come back after briefly getting better, a bacterial infection may be involved and treatment is likely needed. Chronic sinusitis, by definition, lasts twelve weeks or longer.
How do you get a sinus infection?
Most sinus infections begin with a viral upper respiratory infection, like the common cold, that causes the sinus lining to swell and block normal mucus drainage. Bacteria can then grow in the trapped fluid. Allergies, structural issues like a deviated septum, and nasal polyps can also make the sinuses more prone to becoming infected.
Is a sinus infection contagious?
Viral sinus infections can spread from person to person, especially in the early stages when sneezing and nasal discharge are present. Bacterial sinus infections are generally not contagious. A good rule of thumb: if you have a fever, take extra precautions around others. Washing your hands frequently and avoiding close contact with sick individuals can help reduce your risk.
What does a sinus infection feel like?
A sinus infection typically produces a feeling of pressure or fullness in the face, particularly around the cheeks, forehead, and behind the eyes. You may also notice a heavy, congested feeling in your nose, a dull or throbbing headache, thick nasal discharge, and general fatigue. Some people experience tooth or jaw pain due to the location of the maxillary sinuses near the upper teeth.
How do I know if I have a sinus infection?
Key indicators include facial pain or pressure, nasal congestion with thick discolored discharge, symptoms lasting more than ten days without improvement, and a reduced sense of smell. A cold typically improves within seven to ten days – if yours isn’t getting better, or gets worse after initially improving, a sinus infection is a likely explanation. A provider can confirm the diagnosis and determine whether treatment is needed.
Is amoxicillin good for a sinus infection?
Amoxicillin has historically been used to treat bacterial sinus infections, though it is not always the first choice today, as some bacteria have developed resistance to it. The right antibiotic depends on your symptoms, how long they have lasted, and your medical history. Most viral sinus infections do not require antibiotics. A provider evaluation helps ensure you receive the appropriate treatment.
Can a sinus infection make you dizzy?
Yes. Sinus congestion and inflammation can affect the pressure and fluid balance in the structures near your ears, which can contribute to dizziness or a feeling of being off-balance. Postnasal drip and sinus pressure can also cause headaches that are sometimes accompanied by lightheadedness. If dizziness is persistent or severe, it is worth discussing with a provider.
Can sinusitis be prevented?
Not always, but there are steps that can meaningfully reduce how often sinus infections occur:
- Treat underlying allergies, which are one of the most common drivers of chronic sinusitis
- Use saline nasal rinses regularly to keep the nasal passages clear
- Stay well-hydrated to support healthy mucus production
- Avoid cigarette smoke and other airborne irritants
- Wash hands frequently during cold and flu season
- Use a humidifier in dry environments
For patients with recurrent sinusitis tied to allergies, immunotherapy, including sublingual allergy drops, can help retrain the immune system and reduce the inflammatory response that contributes to sinus problems over time.