Common Cold vs Flu and Allergies: Key Differences

medica-seed-editor · October 17, 2026, 11:44am

The common cold is a viral infection of the upper respiratory tract that differs in severity and cause from influenza and seasonal allergies.

What is the difference between a cold and flu?

Although the symptoms are similar, there are fundamental differences between a cold and flu in terms of intensity and complications:

Cause and Severity: Various viruses cause the common cold, which is usually milder, while “Influenza” viruses cause the flu, which is more dangerous.
Onset Speed: Cold symptoms begin gradually and resolve within a week, whereas flu symptoms appear suddenly and acutely.
Fever and Fatigue: Fever is rare in colds (except in children), while it is common in the flu, reaching 38°C or higher. The latter also causes severe exhaustion that may last up to three weeks in the elderly or immunocompromised.
Distinctive Symptoms: Colds are dominated by runny nose and congestion, while the flu is characterized by muscle aches and a dry cough.
Complications: A cold rarely leads to serious problems, but the flu can cause pneumonia.

How to distinguish between a cold and allergies?

Confusion may occur due to similar sneezing and runny nose symptoms, but they can be distinguished as follows:

Nature of Secretions: Mucus in allergies is clear, while in a cold, it becomes thicker and turns yellow or green due to the presence of white blood cells.
Itching: Itchy eyes are a strong indicator of allergies, whereas fever and aches point to a viral infection.
Duration: Colds last from one to two weeks, but allergies may extend for six weeks or more and worsen with exposure to triggers.

The common cold in children and infants

Children experience colds frequently, with infections reaching up to 5 times in a single winter.

Causes: They are caused by “rhinoviruses” spread in the air or exposure to dry air; smoking exacerbates the condition and increases the likelihood of bronchitis.
Symptoms: It usually begins with a burning sensation in the pharynx, followed by nasal congestion, headache, and loss of appetite.
Relief Methods: It is recommended to wash the child’s nose with saline solution, humidify the room with steam, and use Vaseline externally to soothe nasal irritation.
Medication Alerts: Aspirin should not be given to children under 12 years old. Oral decongestants are cautioned against for those under two years and are strictly forbidden for those under 6 months.

Prevention and Infection

Viruses are transmitted via respiratory droplets or by touching contaminated surfaces; they may enter the body through the eyes and then move to the nose and throat.

Prevention: Wash hands with soap and water for 20 seconds, or use an alcohol-based sanitizer with at least 60% concentration.
Healthy Habits: Cover the mouth when coughing, avoid touching the face, and disinfect door handles and electronic devices.
Vaccines: A vaccine is available for the flu (including seasonal and swine flu), but there is no specific vaccine for the common cold.

Frequently Asked Questions

What is a common cold?

It results from an infection by various types of viruses, such as rhinoviruses, which are transmitted from person to person through contact or droplets.

What is the treatment for a cold in children?

There are no medicines that cure the disease because time is the primary healer, but analgesics and antipyretics such as paracetamol or ibuprofen are used to relieve symptoms.

How long do cold and flu viruses stay alive after coughing or sneezing?

The duration ranges from several hours to days, depending on the type of virus, the nature of the surface (hard surfaces last longer), and climatic conditions such as humidity and temperature.

What are the symptoms of a severe cold?

Concerning signs include a persistent or productive cough, or a temperature rising above 38.8°C accompanied by chills and shortness of breath.

When should you visit a doctor?

Medical care should be sought immediately in the following cases:

Difficulty or shortness of breath.
Fever higher than 38.8°C with chills.
Persistent cough or cough accompanied by thick mucus.
In children: If symptoms appear that require cough medicines or decongestants.

Disclaimer: This content is for informational purposes only and does not substitute for professional medical advice.