What Causes an Upper Respiratory Infection?

Most URIs are caused by viruses—such as rhinoviruses (the main culprit behind the common cold), influenza, parainfluenza, respiratory syncytial virus (RSV), adenovirus, and coronavirus. These viruses spread easily from person to person through respiratory droplets (for example, when someone coughs or sneezes), or by touching contaminated surfaces and then touching your eyes, nose, or mouth.

While viral infections are the most common, some upper respiratory infections can be caused by bacteria. One of the most recognized is strep throat, caused by Streptococcus pyogenes. Other bacteria, including Haemophilus influenzae, Moraxella catarrhalis, and Bordetella pertussis, can also be responsible, especially in specific age groups or in people with weakened immune systems.

Environmental factors can also increase your risk of developing a URI. Exposure to irritants such as tobacco smoke or polluted air can make your airways more susceptible to infection. Additionally, URIs occur more often during the fall and winter months, when people are in closer contact indoors and respiratory viruses tend to survive longer in cooler, drier air.

At Universal Urgent Care, our experienced providers can help diagnose the cause of your upper respiratory symptoms and recommend the most appropriate treatment. Whether your infection is viral or bacterial, or if environmental factors are making your symptoms worse, we are here to provide timely, compassionate care to help you feel better fast.

At Universal Urgent Care, we frequently treat patients with upper respiratory infections, which are most often caused by viruses such as rhinoviruses, influenza (the flu), and coronaviruses. Understanding how these viruses work can help you recognize symptoms early and know when to seek medical attention.

When someone with a viral infection coughs, sneezes, or even talks, tiny droplets containing the virus. Once inside, the virus attaches to the cells lining your upper respiratory tract—this includes your nose, throat, and sometimes your sinuses and voice box (larynx).

After attaching, the virus takes over your cells’ machinery to make more copies of itself. This process damages your cells and triggers your immune system to respond. The resulting inflammation and swelling in your upper airways cause the familiar symptoms of an upper respiratory infection: runny or stuffy nose, sore throat, cough, and sometimes a mild fever. Your body also produces extra mucus to help trap and flush out the virus.

Most upper respiratory infections stay in the nose and throat, but in some cases, they can move deeper into the lungs and cause more serious illness—especially in young children, older adults, or people with underlying health conditions.

When you’re exposed to allergens such as pollen, dust mites, or pet dander, your body may react with inflammation and irritation in the nasal passages and upper respiratory tract—commonly known as allergic rhinitis. This can cause symptoms like a runny or stuffy nose, sneezing, and itchy eyes.

The swelling and excess mucus caused by allergies can create an ideal environment for viruses and bacteria to thrive. Allergic inflammation can also impair the natural defense mechanisms in your nose and airways, making it harder for your body to clear out germs.

It’s important to know the difference between allergy symptoms and signs of an infection. Allergies typically don’t cause fever or body aches, which are more commonly seen with infections. If you notice your symptoms getting worse, or you develop a fever or other new symptoms, it may be time to seek medical care.

At Universal Urgent Care, we can help you manage your allergy symptoms and reduce your risk of secondary infections. Strategies include avoiding known triggers, regular cleaning to reduce allergen exposure, and using medications such as antihistamines or nasal corticosteroids as appropriate.

Smoking significantly increases your chances of developing an upper respiratory infection. The chemicals in tobacco smoke damage the lining of your airways and impair your body’s natural defenses. Normally, tiny hair-like structures called cilia help clear out mucus and germs from your respiratory system. Smoking, however, paralyzes or destroys these cilia, making it much easier for bacteria and viruses to cause infections.

In addition, smoking weakens your immune system. As a result, your body is less able to fight off the germs that cause common upper respiratory infections, such as the common cold, sinus infections, sore throat (pharyngitis), and laryngitis. Not only are smokers more likely to get these infections, but symptoms can be more severe and complications more common.

Secondhand smoke is also a concern—especially for children—since developing lungs are particularly vulnerable to irritation and infection.

Our providers encourage patients to quit smoking or avoid exposure to tobacco smoke to reduce their risk of recurrent or severe respiratory infections.

Upper respiratory infections (URIs) are among the most frequent reasons people seek medical attention, impacting children and adults alike, especially during peak cold and flu seasons. At Universal Urgent Care, we are dedicated to helping our community stay healthy by providing fast, expert care and practical prevention tips for URIs.

URIs affect the nose, throat, sinuses, and larynx, with common examples including the common cold, sinus infections, strep throat, and laryngitis. Most URIs are caused by viruses like the rhinovirus, coronavirus, and influenza virus, but sometimes bacteria such as Streptococcus pyogenes (which causes strep throat) may be involved. These germs spread easily via respiratory droplets from coughs and sneezes, or by touching contaminated surfaces and then your face.

Recognizing Upper Respiratory Infections

Symptoms of URIs often include:

● Runny or stuffy nose
● Sore throat
● Cough
● Sneezing
● Mild fever
● Headache or body aches

While most URIs resolve on their own, they can occasionally lead to more serious conditions or worsen chronic health issues like asthma. If you experience high fever, difficulty breathing, or symptoms that persist or worsen, Universal Urgent Care is here to provide prompt evaluation and treatment — no appointment needed.

Prevention Starts with You — And Us

At Universal Urgent Care, we empower our patients with the knowledge and tools to prevent URIs:

● Handwashing: Wash your hands frequently with soap and water, especially after being in public spaces or touching your face.
● Avoid Close Contact: Steer clear of individuals who are sick, and avoid sharing personal items.
● Cough/Sneeze Etiquette: Cover your mouth and nose with a tissue or your elbow to help prevent the spread of germs.
● Stay Healthy: Support your immune system with balanced nutrition, adequate sleep, and regular exercise.
● Vaccinations: Our clinic offers annual flu shots and other recommended vaccines to help protect you and your family.
● Clean Surfaces: Regularly disinfect high-touch surfaces at home, work, and school.

Universal Urgent Care: Your Partner in Respiratory Health

If you or your loved ones develop symptoms of an upper respiratory infection, Universal Urgent Care is here to help. Our experienced providers offer thorough evaluation, diagnostic testing (including rapid strep and flu tests), and evidence-based treatment to help you recover quickly and safely. For your convenience, we offer extended hours and walk-in visits to ensure you get the care you need, when you need it. For more information, contact us or book an appointment online. We are located at 2728 Ming Ave, Bakersfield, CA 93304. We serve patients from Bakersfield CA, Sagepointe CA, Wible Orchard CA, Rexland Acres, Gosford CA, and surrounding areas.