How to Tell If You Have a Sinus Infection (And When to See a Doctor)

A common cold and an allergic reaction can have symptoms similar to those of a sinus infection. Many people misdiagnose these conditions because nasal congestion, runny nose, facial pressure, or headache are present in all of them. However, there are three characteristic signs of a sinus infection: symptoms that last longer than 10 days, facial pressure that intensifies when bending forward, and a “double worsening” (it seems to get better and then gets worse again).

At San Tan Allergy & Asthma in Gilbert, Arizona, we have experience helping people identify the true cause of their sinus problems so we can provide personalized treatment. That’s why we teach you how to distinguish between all these conditions. With this knowledge, you’ll know when home treatment is sufficient and when to see a specialist. 

What Is a Sinus Infection?

Also known as sinusitis, a sinus infection is the inflammation of the tissue lining the sinus cavities. It is usually caused by a virus, but it can also be caused by bacteria, fungi, or allergic reactions.

It is important to note that the paranasal sinuses are located in four main areas:

1. Frontal sinuses (forehead).
2. Ethmoid sinuses (between the eyes).
3. Maxillary sinuses (cheeks).
4. Sphenoid sinuses (behind the nose).

Inflammation does not always mean there is an active infection. In fact, many people experience inflammation caused solely by allergies or environmental irritants.

How Your Sinuses Normally Work

The paranasal sinuses are lined with a membrane known as the “mucosa,” a name derived from the fact that it produces mucus to trap particles, impurities, and microorganisms. Little cilia, or tiny hairs, sweep this mucus towards the nose, helping to keep the airways clear and allowing for proper drainage. 

Signs and Symptoms of a Sinus Infection

Although symptoms may vary from person to person, here are the most common: 

• Pressure or pain that may occur in the forehead, cheeks, between the eyes, or in the upper teeth.
• Nasal congestion that does not improve after several days.
• Thick, discolored nasal discharge (although color alone does not confirm a bacterial infection).
• Postnasal drip.
• Loss of smell or taste.
• Headache that usually worsens when bending forward.
• Persistent fatigue.
• Mild fever.
• Bad breath.
• A sensation of pressure or discomfort in the ears.

Most people have several symptoms together. The best indicator that it is sinusitis and not allergies or a cold is when the patient has facial pressure, constant congestion and discomfort lasting more than a week at a time.

Symptoms That Should Send You to a Doctor Today

These are medical signs you cannot ignore and that require immediate medical attention:

• A fever higher than 102 °F.
• Significant swelling that appears on only one side of the face.
• Abnormal changes in vision.
• Confusion or a stiff neck.
• A headache that is very different from a normal sinus headache.

These cases are rare but can indicate underlying complications requiring same-day medical attention.

Sinus Infection vs. Allergies vs. a Cold: How to Tell the Difference

While colds, allergies and sinus infections can have shared symptoms, occur during certain times of the year and may start in a similar way, it is important to distinguish between the three:

If you’re unsure, allergy doctors are a good place to start.

When Allergies Turn Into a Sinus Infection

If allergic rhinitis is left untreated, the constant inflammation prevents normal mucus drainage. Because of this, secretions build up and the chance of developing a secondary infection increases.

Many people with year-round allergies often experience recurrent sinusitis. Managing allergic inflammation and its triggers is usually the best way to break that cycle and find relief.

Acute vs. Chronic Sinusitis

The easiest way to distinguish between different types of symptoms is to look at how long they last.

Acute Sinusitis

Acute sinusitis usually lasts less than 4 weeks. It is almost always caused by a virus. As for recovery, it almost always resolves on its own within approximately 7 to 10 days. If symptoms improve and then worsen again, this usually indicates a high probability that a bacterial infection has developed. This is an even better predictor than the color of the mucus.

Subacute and Chronic Sinusitis

Duration may vary:

• Subacute sinusitis: lasts between 4 and 12 weeks.
• Chronic sinusitis: persists for 12 weeks or longer.
• Recurrent acute sinusitis: characterized by 4 or more episodes per year. 

If patients experience prolonged episodes, this may indicate allergies, nasal polyps, a deviated septum, or even problems with the immune system.

What Causes Sinus Infections?

There are several factors that can lead to a sinus infection:

• Viral infections of the upper respiratory tract.
• Bacterial infections following a cold.
• Fungal infections, which are less common but more serious.
• Nasal polyps or a deviated septum that impede drainage.
• Environmental pollution, smoke, and dental infections.
• Allergic rhinitis and untreated environmental allergies.

If you suspect the latter, you should request an allergy test to rule out other triggers.

Why Sinus Infections Are Common in Arizona

Arizona has rather unique climatic conditions that contribute to sinus problems for much of the year. In fact, approximately 35% of Arizona residents suffer from hay fever, which is characterized by nasal inflammation and can become a chronic condition. 

Similarly, dust storms during the monsoon season carry fine particles into the nose. Various types of pollen—such as olive, mulberry, ragweed, and Bermuda grass—appear at different times of the year.

Constant use of air conditioning, due to high local temperatures, dries out the nasal mucosa and reduces the cilia’s ability to clear secretions. This means that the combination of dry air, dust, and allergens causes many people in the East Valley to experience discomfort that does not follow the typical pattern of winter colds.

How Doctors Diagnose a Sinus Infection

Most sinus infections are diagnosed based on a physical examination and medical history. Imaging tests are not usually necessary, since the main goal is to determine whether the cause is viral or bacterial, or whether there is an allergic or structural cause that explains the symptoms.

Physical Exam and History

A doctor will examine the patient’s nose, throat, and ears. The doctor will also assess how long the symptoms have been affecting the patient’s life, how they have progressed, and whether there is a history of other recurring infections.

When Further Testing Is Needed

If your symptoms persist or keep coming back, the goal is to find out why. The most common hidden culprit is ongoing allergic inflammation. A quick in-office skin test can show whether allergens like pollen, dust, or mold are keeping your sinuses inflamed. Certain mold allergies can also cause a more stubborn form of the condition called allergic fungal sinusitis. Results are interpreted alongside your medical history to confirm your true triggers.

If asthma or another airway condition may be involved, respiratory testing helps complete the picture. In some patients, a sensitivity to aspirin or other NSAIDs turns out to be the contributor, and that form of sinus disease has its own dedicated treatment.

How to Treat a Sinus Infection at Home

Most sinus infections clear up on their own and do not require antibiotics. Things that may help include:

• Nasal rinses with saline solution using distilled or previously boiled water.
• Warm compresses on the face.
• Decongestant nasal sprays for up to three days.
• Oral decongestants when appropriate.
• Steam inhalation.
• Staying well-hydrated.
• Rest.
• Over-the-counter pain relievers to relieve pain.

An allergy expert will likely advise that antibiotics are not necessary during the first 10 days, because most infections are viral. Not only do they not speed up recovery, but their unnecessary use can also promote bacterial resistance and increase the risk of other adverse effects. Do not use antibiotics without a doctor’s recommendation.

When You Need Prescription Treatment

Is there a confirmed bacterial infection, are symptoms persisting for more than 10 days, or do you notice a pattern of “double worsening”? In those cases, your doctor might prescribe antibiotics. It’s also common for nasal corticosteroids to be prescribed to control chronic inflammation. In specific cases, your doctor might recommend short courses of oral corticosteroids.

When to See an Allergist or ENT for Sinus Problems

Are your sinus problems frequent, or are they not improving as they should? In these situations, see a specialist:

• Four or more sinus infections a year.
• Symptoms last more than twelve weeks.
• The infection reoccurs after antibiotics have been taken.
• If you have persistent congestion accompanied by itchy eyes or asthma.
• If nasal polyps or a deviated septum are suspected.

There, you may find allergy relief or discover that your condition is caused by something else.

How an Allergist Helps With Chronic Sinus Issues

If you see a team of allergists, they can identify the environmental triggers responsible for the inflammation. They’ll do this through skin tests. Identifying the source allows for the development of a targeted treatment. This can help reduce the frequency of infections.

In some patients, immunotherapy helps reduce the immune system’s exaggerated response over time. Sometimes, there are also anatomical issues. If that’s the case, the allergist works closely with an ear, nose, and throat specialist.

How to Prevent Sinus Infections

The best way to prevent sinus infections is:

• Treat seasonal allergies before they cause inflammation.
• Use a humidifier during the driest months (April, May, and June).
• Avoid smoke, strong fragrances, and dust that can irritate you.
• Practice good hand hygiene to prevent colds and the flu.
• Stay well-hydrated, even during Arizona’s dry weather.
• See an ENT specialist to correct anatomical problems when necessary.

Following these steps can help prevent this problem.

Sinus Relief in Gilbert, Mesa, Chandler, and the Phoenix Valley

Sinus infections usually clear up on their own. However, if you experience repeated episodes or your symptoms don’t improve on their own, you may benefit from a professional evaluation like the one we provide at San Tan Allergy & Asthma. As allergy doctors in Gilbert, we treat patients in the East Valley who suffer from chronic sinusitis, allergy-related inflammation, and congestion that doesn’t respond to over-the-counter treatments. Here’s what our patients say:

Would you like more details about our services? Call (480) 626-6600 or schedule an appointment online.