Flu in Children: How to Recognize the Symptoms and When to See a Doctor

What is Important to Know About Influenza

Influenza is an acute viral infection that affects the respiratory tract and can cause complications. The illness most commonly spreads during the autumn-winter period. Children, especially those under the age of 5 and those with chronic diseases, are particularly vulnerable.

Unlike many other acute respiratory viral infections (ARVI), influenza often begins suddenly and is accompanied by a significant deterioration in well-being. Just a few hours ago, the child may have felt well, and then they develop a high fever, weakness, headache, and other symptoms.

At the "Dobrobut" medical network, we rely on the principles of evidence-based medicine: we help quickly identify the pathogen and prescribe only those medications that have proven efficacy and are safe for the child’s body. If you are concerned about the first primary symptoms of influenza in children, our pediatricians and doctors are ready to provide professional assistance around the clock.

How Influenza is Transmitted and What is Its Incubation Period

The causative agent of the disease is the influenza virus. It is primarily transmitted during the inhalation of infected respiratory particles that are spread while breathing, talking, coughing, and sneezing. Infection is also possible through contaminated hands and surfaces, although this route is considered less common.

After infection, the virus multiplies in the cells of the respiratory tract. The incubation period — the time from infection to the appearance of the first signs — usually lasts about two days, but it can range from one to four days. If you notice that the child’s well-being is worsening literally before your eyes, the characteristic symptoms of influenza in children allow for differentiation from a common cold within the first hours.

Main Symptoms of Influenza in Children

Influenza in children most commonly presents with the following symptoms:

• sudden increase in body temperature;
• chills;
• significant weakness and fatigue;
• headache;
• muscle and joint pain;
• dry cough;
• pain or irritation in the throat;
• runny or stuffy nose;
• loss of appetite.

In some children, especially younger ones, nausea, vomiting, and diarrhea may also occur.

The intensity of symptoms may vary depending on the child's age, overall health status, and the course of the illness. The absence of a high fever does not rule out influenza.

When to See a Doctor

Consult a pediatrician if the child’s condition causes concern, the fever persists for a long time, symptoms worsen, or after a temporary improvement, the condition worsens again.

It is especially important to consult a doctor in a timely manner if the child has bronchial asthma, diabetes, heart or lung diseases, immunodeficiency, or other conditions that increase the risk of complications. Children in risk groups may require medical evaluation even at the onset of the illness.

Immediate medical assistance is necessary if the child exhibits:

• difficult or very rapid breathing;
• retraction of the chest during inhalation;
• bluish lips or face;
• severe chest pain;
• pronounced lethargy, confusion, or inability to wake the child;
• convulsions;
• signs of significant dehydration, including a lack of urination for an extended period;
• sudden deterioration after a temporary improvement.

How Influenza is Diagnosed in Children

The diagnosis is made by the doctor based on complaints, medical history, physical examination, and assessment of symptoms. In many cases, additional examinations are not needed.

As indicated, the doctor may recommend testing for the influenza virus. This includes rapid tests for influenza virus antigens or molecular diagnostic methods, such as polymerase chain reaction (PCR). The choice of method depends on the clinical situation and the availability of tests.

If complications, such as pneumonia, are suspected, the doctor determines the necessity for additional investigations. Depending on the child’s condition, these may include laboratory tests or instrumental examinations.

No special preparation is usually needed for a routine visit to the pediatrician. If testing is planned, it is advisable to follow the medical professional's recommendations. A timely visit to the clinic allows for a quick clarification of influenza symptoms in children and the rapid development of a safe action plan.

How Recovery Proceeds

The main symptoms of uncomplicated influenza usually gradually diminish over several days, with most manifestations resolving within about a week. However, cough, weakness, and rapid fatigue may persist longer.

During recovery, it is important to ensure the child:

• gets sufficient rest and quality sleep;
• drinks regularly in small amounts;
• is in comfortable indoor conditions with regular ventilation;
• gradually returns to their usual activity regimen after feeling better.

If symptoms do not decrease, worsen, or if fever recurs after improvement, it is necessary to consult the doctor again.

Influenza Prevention

To reduce the risk of infection, it is recommended to:

• wash hands regularly with soap;
• ventilate spaces;
• avoid close contact with people who have respiratory infection symptoms;
• teach the child to cover their mouth and nose with a tissue or the crook of their elbow when coughing or sneezing;
• not touch their eyes, nose, and mouth with unwashed hands;
• maintain a sleep schedule and provide balanced nutrition.

Comprehensive prevention of influenza in children includes both adherence to personal hygiene rules and creating a healthy environment at home.

Vaccination remains the most effective way to protect against the disease and its severe consequences. Systematic influenza prevention in children through annual immunization significantly reduces the likelihood of hospitalization and the development of pneumonia.

If the child does become ill with influenza, the doctor may consider prescribing antiviral medications (e.g., oseltamivir). Their effectiveness is greatest when treatment is initiated early — within the first 48–72 hours after the onset of symptoms. They are especially recommended for children with a severe course of influenza, hospitalized patients, and children in risk groups.

What Not to Do

To avoid harming the child's health and to prevent complications during the illness, it is strictly prohibited to:

• Self-administer acetylsalicylic acid (aspirin). The use of this medication by children during viral infections can lead to a life-threatening condition — Reye's syndrome (severe liver and brain damage).
• Prescribe antibiotics without a doctor's recommendation. Antibiotics act only on bacteria and are completely ineffective against influenza viruses. Unjustified antibiotic use harms the microflora and creates resistance in bacteria.
• Rub the child with alcohol or vinegar. Physical cooling using alcohol or vinegar solutions leads to the absorption of toxic substances through the skin and causes dangerous vascular spasms.
• Apply heat therapies and steam inhalations during a high fever. Mustard plasters, foot baths, or hot steam increase the burden on the cardiovascular system and can cause burns to the respiratory tract.
• Use immunomodulators and cough syrups without a prescription. Medications with unproven efficacy or syrups that thin mucus are contraindicated for young children, as they cannot effectively cough up the increased volume of phlegm.

To schedule an appointment with a pediatrician, undergo express diagnostics, or get vaccinated, call our contact center or fill out the form on the website.