Respiratory Tract Infections (RTIs)

Immune & Inflammation Support Care
Written By Jennifer Tang

Overview

Respiratory tract infections (RTIs) are illnesses affecting the nose, sinuses, throat, airways, or lungs. They include common illnesses such as colds, influenza, COVID-19, RSV infection, acute bronchitis, and pneumonia. Many are caused by viruses and improve with time and supportive care, although some infections can become more serious or require specific medical treatment.¹˒²

At Tangible Health, we take an individualized approach by looking at your symptoms, duration of illness, breathing, fever, medical history, medications, nutritional needs, sleep, and risk factors for complications. For mild and uncomplicated infections, care can focus on comfort and recovery. When symptoms suggest pneumonia, significant breathing difficulty, or another potentially serious infection, appropriate medical assessment takes priority.

What Are Respiratory Tract Infections?

Respiratory tract infections are commonly grouped according to the part of the respiratory system affected.

Upper respiratory tract infections involve the nose, sinuses, and throat. Examples include:

  • The common cold

  • Viral sore throat

  • Some sinus infections

  • Influenza and COVID-19 when symptoms are primarily upper respiratory¹˒³

Lower respiratory tract infections involve the larger airways or lungs. Examples include:

  • Acute bronchitis

  • Bronchiolitis

  • Pneumonia¹˒⁴

Viruses cause many respiratory infections, including influenza, COVID-19, RSV, rhinoviruses, and other common respiratory viruses. Bacteria can also cause respiratory infections, including some cases of pneumonia, sinusitis, and strep throat.¹˒⁴ Different infections can cause very similar symptoms, so a cough, fever, sore throat, or congestion alone does not always reveal which virus or bacterium is responsible.

Common Signs & Symptoms

Symptoms depend on the infection and which part of the respiratory tract is affected.

Upper respiratory symptoms may include:

  • Runny or stuffy nose

  • Sneezing

  • Sore or irritated throat

  • Cough

  • Sinus pressure or congestion

  • Headache

Lower respiratory symptoms may include:

  • Persistent or worsening cough

  • Cough with mucus

  • Wheezing

  • Chest discomfort

  • Shortness of breath

  • Faster or more difficult breathing⁴˒⁵

General symptoms may include:

  • Fever or chills

  • Fatigue or weakness

  • Muscle or body aches

  • Headache

  • Reduced appetite

  • Feeling generally unwell¹˒³

The duration also varies. A common cold often improves within one to two weeks, while the cough from acute bronchitis can persist for several weeks even after the infection itself is improving.⁴˒⁶ Symptoms such as increasing shortness of breath, chest pain, persistent high fever, or significant weakness can suggest a more serious lower respiratory infection and warrant medical assessment.⁵

Causes & Contributing Factors

Viral Respiratory Infections
Viruses cause most uncomplicated respiratory tract infections. Common examples include influenza, COVID-19, RSV, and the many viruses responsible for the common cold.¹˒² Because antibiotics act against bacteria rather than viruses, they do not treat colds or influenza and are usually not helpful for uncomplicated acute bronchitis.⁶˒⁷

Bacterial Infections
Bacteria are responsible for some respiratory infections, including certain pneumonias, strep throat, and selected cases of sinusitis. Antibiotics may be important when a bacterial infection is diagnosed or strongly suspected.⁵˒⁷ The presence of coloured mucus alone does not necessarily mean an infection is bacterial or that antibiotics are required.

Exposure & Transmission
Respiratory viruses can spread through respiratory particles released when people breathe, speak, cough, or sneeze, as well as through close contact and contaminated hands or surfaces in some circumstances. Staying home when sick, improving indoor ventilation, hand hygiene, and using appropriate masking in higher-risk settings can help reduce transmission.²˒⁸

Risk of More Severe Illness
The risk of complications varies according to the infection and the individual. Older adults, infants and young children, pregnant people, people with weakened immune systems, and those with chronic lung, heart, kidney, or metabolic conditions may have a greater risk of severe respiratory illness.¹˒³˒⁵

Smoking and chronic respiratory conditions such as asthma or COPD can also make respiratory symptoms more significant.

Our Approach to Respiratory Tract Infections

At Tangible Health, we focus first on understanding what kind of respiratory illness you may have and whether supportive care is appropriate.

Your Current Symptoms & Illness Pattern
We review when symptoms began, cough, congestion, sore throat, fever, breathing, chest symptoms, energy, sleep, recent exposures, and whether your illness is improving or worsening. Symptoms suggesting pneumonia, significant breathing difficulty, severe influenza or COVID-19, or another complication are referred for appropriate medical evaluation.

Your Recovery & Overall Health
For mild or recovering respiratory infections, we look at hydration, food intake, sleep, medications and supplements, activity, underlying health conditions, and factors that may be slowing recovery. Frequent respiratory illnesses can also be reviewed in context. Rather than assuming someone simply has a “weak immune system,” we consider factors such as repeated exposure, sleep, nutrition, smoking, chronic respiratory conditions, medications, and whether the pattern warrants further investigation.

Your Goals
Your priorities may include managing cough or congestion, maintaining hydration and nutrition, improving sleep while sick, returning gradually to normal activity, or understanding when lingering symptoms need further assessment. Your care plan is developed around the infection, symptom severity, health history, and goals.

Treatments That May Be Included

Your individualized care plan may include:

  • Clinical Nutrition to maintain adequate food and fluid intake during illness and address nutritional deficiencies when clinically relevant

  • Lifestyle Medicine to support rest, sleep, hydration, gradual return to activity, smoking cessation when relevant, and strategies that reduce transmission

  • Nutraceuticals & Supplements when there is a specific indication and the potential benefit outweighs the risks

  • Botanical Medicine for selected symptom-supportive uses when clinically appropriate, with consideration of medication interactions, pregnancy, and other health conditions

  • Naturopathic Counselling to support stress management, sleep, recovery behaviours, and sustainable health routines

  • Medication & Supplement Review to help avoid duplicating ingredients in cold and flu products and identify potential medication or supplement interactions

  • Collaborative Care when testing, antiviral medication, antibiotics, imaging, or other medical treatment may be appropriate

Rest, adequate fluids, and symptom-directed care are sufficient for many uncomplicated viral respiratory infections.³ Antibiotics should be reserved for infections where a bacterial cause warrants them.⁶˒⁷

What to Expect

Initial Assessment
We begin with a detailed review of your symptoms, when they started, cough and breathing patterns, fever, recent respiratory exposures, medical history, medications and supplements, vaccination history when relevant, sleep, nutrition, and factors that may increase your risk of complications.

Respiratory Assessment & Medical Review
Many mild respiratory infections can be assessed from symptoms and clinical history without extensive testing. Depending on your presentation and risk factors, testing for influenza or COVID-19, a throat swab, chest examination, oxygen measurement, or chest imaging may be appropriate. Pneumonia and other lower respiratory infections may require further medical investigation.⁵˒¹⁰

Personalized Plan
Your care plan is developed around the likely infection, symptom severity, nutritional and hydration needs, medications, medical history, and goals. The focus is on appropriate symptom support and recovery rather than trying to “boost” the immune system.

Ongoing Support
Follow-up can help determine whether symptoms are resolving normally. A cough can linger after some respiratory infections, but persistent or worsening symptoms may require reassessment for pneumonia, asthma, sinusitis, post-viral airway irritation, or another cause.⁴˒⁶

When to Seek Support for Respiratory Tract Infections

Consider speaking with a healthcare provider if:

  • Symptoms are worsening rather than gradually improving

  • Fever is persistent or returns after initially improving

  • A cough continues for several weeks or is becoming more severe

  • You experience wheezing or recurrent chest symptoms

  • You develop significant sinus or throat symptoms that are not improving

  • Respiratory infections occur unusually often or recovery consistently takes much longer than expected

  • You have a chronic lung, heart, kidney, metabolic, or immune condition that increases your risk of complications

  • You may be eligible for early antiviral treatment for influenza or COVID-19¹¹˒¹²

Antiviral treatment for influenza works best when started early, ideally within about 48 hours of symptom onset, although treatment may still be used later in some higher-risk or severely ill patients.¹¹

Seek urgent or emergency medical care for:

  • Difficulty breathing or severe shortness of breath

  • Blue, grey, or unusually pale lips or skin

  • Significant or persistent chest pain

  • New confusion or difficulty staying awake

  • Coughing up significant amounts of blood

  • Severe weakness, fainting, or dehydration

  • Rapidly worsening illness

  • Severe symptoms in someone at high risk for respiratory complications³˒⁵

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Frequently Asked Questions

  • Yes. Colds, influenza, COVID-19, RSV, and most cases of acute bronchitis are viral. Some respiratory infections, including certain cases of pneumonia, strep throat, and sinusitis, can be bacterial.¹˒⁶˒⁷

  • Not usually. Antibiotics do not work against viruses and therefore do not treat colds, influenza, COVID-19, or most uncomplicated cases of acute bronchitis. They are important when an appropriate bacterial infection is diagnosed or strongly suspected.⁶˒⁷

  • It depends on the infection. Many uncomplicated viral illnesses improve within one to two weeks, but symptoms such as cough or fatigue may last longer. Acute bronchitis commonly improves over two to three weeks, and its cough can sometimes persist beyond four weeks.⁴˒⁶

  • Cold symptoms often develop more gradually and commonly include congestion, runny nose, and sore throat. Influenza tends to begin more suddenly and is more likely to cause fever, significant fatigue, headache, cough, chills, and body aches.³

  • Pneumonia may cause cough, fever or chills, shortness of breath, rapid breathing, significant weakness, and chest pain that worsens when coughing or taking a deep breath. These symptoms should be medically assessed, especially when they are severe or worsening.⁵

  • No supplement has been established as a reliable substitute for measures such as vaccination, reducing exposure, staying home when sick, and appropriate medical care. Zinc may slightly shorten an existing common cold in some studies, but evidence is uncertain and it does not appear to reliably prevent colds.⁹

  • Not every infection can be prevented, but vaccination, staying home when sick, hand hygiene, improving indoor air quality and ventilation, and taking additional precautions around people at higher risk can reduce transmission and serious illness.²˒⁸ Annual influenza vaccination is recommended for eligible people, and COVID-19 and RSV immunization recommendations depend on age and individual risk.¹³˒¹⁴

  • Airways can remain irritated after a respiratory infection, so a cough may persist after other symptoms have resolved. A cough that continues to worsen, lasts unusually long, or occurs with shortness of breath, fever, blood, or chest pain should be reassessed.⁴˒⁶

  • Naturopathic care can support hydration, nutrition, sleep, symptom management, recovery, and medication or supplement review for mild or recovering respiratory illnesses. It can also help identify when symptoms require testing, antiviral or antibiotic treatment, or further medical assessment.

 

Related Care

Respiratory tract infections may overlap with several areas of health. You may also benefit from:

Jennifer Tang
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