What are the symptoms of infantile急疹?

Sep 04, 2025 Source: Cainiu Health

Dr. Zhou Xiaofeng

Introduction

Infantile roseola typically presents with sudden high fever, rash appearing after the fever subsides, relatively good general condition, mild respiratory symptoms, and gastrointestinal discomfort. It commonly occurs in infants and toddlers between 6 months and 2 years of age. At the onset of the disease, a high fever often suddenly appears, reaching 39°C to 40°C, lasting for 3 to 5 days. During this period, body temperature may temporarily decrease after administration of antipyretic medications.

Infantile急疹, commonly refers to roseola infantum. Typically, roseola infantum generally presents with typical symptoms such as sudden high fever, rash appearing after fever subsides, good mental status, mild respiratory symptoms, and gastrointestinal discomfort. It commonly occurs in infants and toddlers aged 6 months to 2 years. If any abnormalities occur, it is recommended to seek medical attention promptly. Detailed analysis is as follows:

1. Sudden high fever: At the onset of the illness, a sudden high fever often appears, with body temperature reaching 39°C to 40°C, lasting for 3 to 5 days. During this period, the temperature may temporarily drop after taking antipyretics, but tends to rise again. Some infants and young children may experience mild chills.

2. Rash appearing after fever subsides: This is the most characteristic symptom. When the high fever suddenly subsides, the skin rapidly develops a pale red maculopapular rash, starting first from the neck and trunk, gradually spreading to the face and limbs. The rash usually lasts for 1 to 2 days and then fades on its own without leaving any pigmentation.

3. Good mental status: Different from other febrile diseases, during roseola infantum, aside from slight irritability when having a high fever, most children maintain a generally normal mental status and appetite, with their play and activities not significantly affected.

4. Mild respiratory symptoms: Some children may experience mild cough, runny nose, red and swollen throat, and other respiratory manifestations, but the symptoms are usually mild and do not include severe conditions such as difficulty breathing or wheezing, and usually resolve on their own.

5. Gastrointestinal discomfort: A few children may experience mild diarrhea, vomiting, abdominal distension, and other gastrointestinal symptoms. The stool is mostly mushy, with slightly increased frequency, but severe vomiting or watery diarrhea generally does not occur.

When the above symptoms appear in infants and young children, body temperature should be closely monitored, timely physical cooling or antipyretics as prescribed by a doctor should be used to avoid febrile seizures. The diet should be light and easy to digest, with plenty of water intake.

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What should I do if my baby has poor temperature regulation?

In general, poor temperature regulation in infants may be caused by factors such as young age, large fluctuations in environmental temperature, improper clothing, upper respiratory tract infections, or infantile急疹 (sudden rash in infants). It is recommended to seek timely medical attention, identify the underlying cause, and then improve the condition through general treatment, medication, and other approaches under a doctor's guidance. Avoid taking the baby to crowded, poorly ventilated places to reduce the risk of infection.

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How to reduce a child's fever quickly

In general, a child's fever may be caused by factors such as excessive ambient temperature leading to impaired heat dissipation, excessive heat production after vigorous activity, infantile急疹 (roseola), acute tonsillitis, or acute bronchitis. It is recommended to seek timely medical attention, identify the underlying cause, and then improve the condition under a doctor's guidance through general treatment, medication, or other appropriate methods. Regularly monitor the child's body temperature and record temperature changes.

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What type of rash does infantile急疹 (roseola) belong to?

Infantile急疹, also known as roseola or exanthem subitum, is a common self-limiting disease in infants and young children, primarily caused by infection with human herpesvirus 6 (HHV-6) or human herpesvirus 7 (HHV-7). If symptoms occur, it is recommended to seek timely medical attention and treatment at a qualified hospital. In addition, during the course of the illness, infants and young children should maintain adequate hydration to prevent dehydration.

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What juices can be consumed for infantile emergency rash (roseola)?

In general, infants and young children can drink适量 (an appropriate amount of) apple juice, pear juice, orange juice, grape juice, and watermelon juice during episodes of infantile急疹 (exanthema subitum). These juices help replenish the body with fluids and nutrients. In addition, when giving juice to infants and young children, it should be well-diluted to reduce the sugar concentration. Avoid juices with high acidity and strong irritation, such as lemon juice and hawthorn juice.