Why does fever recur every 4 hours with Type A flu, and what should be done?

Generally, "Jia Liu" refers to influenza A, and "fa shao" refers to fever. Recurrent fever every 4 hours in influenza A may be caused by immune reactions, fluid loss, viremia, mycoplasma infection, acute sinusitis, and other reasons. It is recommended to seek timely medical attention and adopt general treatment, medication, and other treatment methods under a doctor's guidance. A detailed analysis is as follows:

1. Immune Reaction

After infection with the influenza A virus, the body's immune system identifies and fights the virus, releasing endogenous pyrogens such as interleukins and tumor necrosis factors. These substances act on the hypothalamic thermoregulatory center, shifting the body's temperature set point upward, thus causing fever. When the immune system continues to fight the virus, recurring fever may occur. Regular physical exercise, a balanced diet, and sufficient sleep can help enhance personal immunity.

2. Fluid Loss

Fever causes the body to lose significant amounts of water through the skin and respiration. If fluids are not replenished timely, blood may become concentrated, impairing heat dissipation and causing recurring fever. It is important to develop the habit of drinking water regularly and increase fluid intake during fever, including warm water, lightly salted water, etc.

3. Viremia

The influenza A virus enters the bloodstream and multiplies extensively, releasing toxins that stimulate the thermoregulatory center, leading to recurring fever. Headache, fatigue, and other symptoms may also be present. Under a doctor's guidance, medications such as oseltamivir phosphate capsules, baloxavir marboxil tablets, and paracetamol tablets may be used for treatment.

4. Mycoplasma Infection

During influenza A infection, the body's immunity decreases, which may lead to a concurrent mycoplasma infection. Metabolic products produced by mycoplasma stimulate the body and cause fever. Common symptoms include an irritating dry cough and chest pain. Treatment should follow medical advice using medications such as azithromycin dry suspension, roxithromycin capsules, and levofloxacin hydrochloride tablets.

5. Acute Sinusitis

Influenza A virus infection spreads to the sinuses, causing inflammation, and the release of inflammatory mediators leads to fever. Symptoms may also include nasal congestion, runny nose, and headache. Under a doctor's guidance, medications such as budesonide nasal spray, mometasone furoate nasal spray, and amoxicillin-clavulanate potassium tablets may be used for treatment.

In daily life, it is also important to avoid crowded places as much as possible, and wear masks during flu season; maintain personal hygiene, wash hands frequently, and avoid touching the eyes, mouth, and nose with hands to reduce the chances of viral infection.