Acute Upper Respiratory Infection: Causes, Symptoms, and Treatment

Written by Medicover Team and Medically Reviewed by Dr Bhima Shankar , Pulmonologists

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Acute upper respiratory infection (URI) refers to infections that affect the upper respiratory tract, including the nasal passages, pharynx, and larynx. These infections are very common and are often referred to as the common cold, although they can also include pharyngitis, laryngitis, and sinusitis.

Most upper respiratory infections are caused by viruses and spread easily through airborne droplets, coughing, sneezing, or direct contact with an infected person. In some cases, bacteria may also cause the infection.

What Are the Types of Acute Upper Respiratory Infection?

Acute upper respiratory infections can occur in different forms depending on the part of the respiratory tract affected.

Common Cold: The most common form of URI, usually caused by rhinoviruses and associated with congestion, sneezing, and cough
Sinusitis: Inflammation of the sinus cavities that can cause facial pain, thick nasal discharge, and pressure around the nose
Pharyngitis: Infection or inflammation of the throat, often presenting with soreness and difficulty swallowing
Laryngitis: Inflammation of the voice box (larynx) leading to hoarseness or temporary loss of voice
Epiglottitis: A rare but serious condition where the epiglottis becomes inflamed and can obstruct the airway

What Are the Symptoms of Acute Upper Respiratory Infection?

Symptoms of acute upper respiratory infections usually appear within a few days of exposure. The severity can vary from mild discomfort to more noticeable respiratory symptoms.

Nasal Congestion and Rhinorrhea

Nasal congestion and rhinorrhea (runny nose) are hallmark symptoms of URIs. These symptoms result from the inflammation of nasal passages and the production of excess mucus.

Sore Throat and Cough

A sore throat and persistent cough often accompany URIs. The irritation in the throat can cause discomfort and difficulty swallowing.

Fever and Fatigue

Mild to moderate fever and fatigue are common in URIs. These symptoms indicate the body's immune response to the infection.

Headache and Body Aches

Headaches and body aches can occur due to the body's inflammatory response to the infection. These symptoms can range from mild to severe.

Sneezing and Watery Eyes

Sneezing and watery eyes are typical symptoms of URIs, often caused by allergens or irritants that exacerbate the infection.

What Are the Causes of Acute Upper Respiratory Infections?

Understanding the causes of URIs can aid in prevention and treatment. The primary causes include:

Viral Infections

The majority of URIs are caused by viruses, such as rhinoviruses, coronaviruses, and adenoviruses. These viruses are highly contagious and spread through respiratory droplets.

Bacterial Infections

While less common, bacterial infections can also cause URIs. Streptococcus pyogenes is a common bacterial pathogen responsible for pharyngitis.

Environmental Factors

Exposure to pollutants, allergens, and irritants can increase the risk of URIs. Poor air quality and smoking are significant contributors.

Weakened Immune System

Individuals with weakened immune systems, due to factors like chronic illness or immunosuppressive medications, are more susceptible to URIs.

When Should You See a Doctor for an Acute Upper Respiratory Infection?

Most acute upper respiratory infections improve within a few days. However, medical advice from Pulmonologists is recommended if symptoms persist or worsen.

High fever lasting more than a few days
Severe sore throat or difficulty swallowing
Persistent cough or breathing difficulty
Symptoms lasting longer than 7 to 10 days
Ear pain, severe sinus pressure, or worsening fatigue

These infections are usually evaluated by a general physician or family medicine specialist. If complications occur, an ENT (ear, nose, and throat) specialist may be consulted.

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How is Acute Upper Respiratory Infection Diagnosed?

Doctors usually diagnose acute upper respiratory infections based on symptoms and physical examination. In some cases, additional tests may be required to confirm the cause or rule out complications.

Clinical examination, including evaluation of symptoms and medical history
Throat swabs or laboratory tests to identify viral or bacterial pathogens
Rapid antigen tests for detecting infections such as streptococcal pharyngitis
Imaging tests, such as X-rays or CT scans, in cases where sinus infection or complications are suspected

What Are the Treatment Options for Acute Upper Respiratory Infection?

Treatment for acute upper respiratory infections mainly focuses on relieving symptoms and managing the underlying cause when necessary.

Over-the-counter medications such as decongestants, antihistamines, and pain relievers to ease symptoms
Antiviral medications in selected cases of viral infections, especially in people with weaker immunity
Antibiotics when a confirmed bacterial infection is present
Supportive care, including rest, staying hydrated, and using saline nasal sprays to reduce discomfort

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