What are the four stages of fever in H1N1 influenza?
Jun 06, 2024
Source: Cainiu Health
Dr. Li Jingli
Introduction
In general, fever refers to an elevated body temperature. The four stages of fever caused by H1N1 influenza are typically divided into the onset phase, peak phase, remission phase, and recovery phase. Patients should choose light, easily digestible foods such as millet porridge, vegetables, and fruits. They should also avoid oily, spicy, and irritating foods such as hot pot, spicy hot pot, and barbecue, to prevent worsening of the condition.
Generally speaking, fever refers to an elevated body temperature. The fever caused by H1N1 influenza typically progresses through four stages: the onset phase, peak phase, remission phase, and recovery phase. If discomfort occurs, it is recommended to seek medical attention promptly. Specific details are as follows:
1. Onset Phase
This stage usually appears within the first 2–3 days after infection with the H1N1 influenza virus. Patients may experience a sudden high fever, with body temperature rapidly rising to 39–40°C, accompanied by symptoms such as headache, muscle pain, sore throat, and cough. At this time, patients may feel weak and have reduced appetite, but serious complications are uncommon.
2. Peak Phase
About 1–2 days after the onset phase, the patient's body temperature reaches its peak at 39.5–40.5°C. During this phase, patients may suffer from severe headaches, intense muscle pain, vomiting, and diarrhea. Complications such as dehydration and electrolyte imbalances may occur at this stage.
3. Remission Phase
About 1–2 days after the peak phase, the patient's body temperature begins to gradually decrease and symptoms start to subside. Body temperature may drop to 38–39°C, and symptoms like headache and muscle pain gradually improve. However, patients may develop symptoms such as coughing and sputum production.
4. Recovery Phase
Following the remission phase, the patient’s body temperature gradually returns to normal and symptoms largely disappear. Patients may still experience mild fatigue and muscle soreness, but serious complications are unlikely in most cases.
A light, easily digestible diet is recommended, such as millet porridge, vegetables, and fruits. Greasy, spicy, and irritating foods—such as hot pot, spicy hot pot (malatang), and barbecue—should be avoided to prevent worsening of the condition.
