Why does influenza A cause persistent high fever and back pain, and what should be done?

Generally, "Jia Liu" refers to influenza A, and "Gao Shao" refers to high fever. If a patient with influenza A develops persistent high fever accompanied by low back pain, it may be caused by excessive fatigue, lactic acid buildup, lumbar muscle strain, myocarditis, rhabdomyolysis syndrome, and other reasons. It is recommended to seek timely medical attention and follow a doctor's guidance regarding general treatment, medication, and other treatment methods. A detailed explanation is as follows:

1. Excessive Fatigue

After contracting influenza A, the body requires more energy to fight the virus. Engaging in physical labor or staying up late at this time can lead to excessive fatigue and damage to the lower back muscles, causing low back pain. After infection with influenza A, it is important to rest adequately, avoid physical labor, and ensure sufficient sleep.

2. Lactic Acid Buildup

Patients with influenza A often experience high fever symptoms, which accelerate the body's metabolism and increase lactic acid accumulation in the muscles, potentially causing muscle aches, including low back pain. It is recommended to replenish fluids promptly to promote lactic acid metabolism and avoid maintaining the same posture for extended periods to reduce lactic acid buildup.

3. Lumbar Muscle Strain

Lumbar muscle strain is an injury to the lower back muscles and soft tissues caused by long-term labor or improper posture. Influenza A can exacerbate lumbar muscle strain, possibly intensifying low back pain. It may also be accompanied by symptoms such as restricted lower back movement and muscle stiffness. Under a doctor's guidance, medications such as analgesic plasters (e.g., Swelling Pain Relief Plaster, Channel-penetrating Pain Relief Plaster) and ibuprofen sustained-release capsules may be used for treatment.

4. Myocarditis

Myocarditis may occur when the virus directly invades the heart muscle or immune responses damage the myocardial cells. Myocardial ischemia and hypoxia can cause radiating low back pain, possibly accompanied by palpitations, fatigue, and other symptoms. Patients may follow medical advice to use medications such as ribavirin tablets, acyclovir tablets, and metoprolol tartrate sustained-release tablets.

5. Rhabdomyolysis Syndrome

Viral infection or high fever may cause destruction of muscle cells, releasing myoglobin that blocks the renal tubules. Myoglobinuria irritates the kidneys, causing low back pain. Patients may also experience symptoms such as cola-colored urine and muscle swelling. Under a doctor's recommendation, patients may use medications such as sodium bicarbonate injection, mannitol injection, and furosemide injection for treatment.

In daily life, avoid self-medicating with painkillers. Maintain adequate hydration, nutrition intake, and moderate rest to reduce the risk of complications.