What illnesses could cause persistent high fever?

High fever refers to hyperthermia. In general, persistent fever or high fever may be caused by conditions such as viral influenza, tonsillitis, bronchitis, rheumatoid arthritis, and systemic lupus erythematosus. Patients can receive symptomatic treatment based on the specific underlying cause. The details are as follows:

1. Viral Influenza

Viral influenza is a disease caused by respiratory viral infections. After viral infection, the immune system initiates a series of defense responses, including the release of inflammatory mediators such as cytokines. These cytokines affect the body's thermoregulatory center, leading to elevated body temperature and fever. Persistent high fever may be related to the continued presence of the virus or a strong inflammatory response induced by the virus. Under medical guidance, patients may use antiviral medications such as oral antiviral liquid or Lianhua Qingwen capsules.

2. Tonsillitis

Tonsillitis is an inflammation of the tonsil tissue, commonly caused by bacterial or viral infections. Fever associated with tonsillitis results primarily from the inflammatory response. During inflammation, the immune system releases cytokines, which trigger an increase in body temperature. Under medical guidance, patients may use medications such as compound Honeysuckle granules or Amoxicillin capsules.

3. Bronchitis

Bronchitis usually involves chronic, nonspecific inflammation and infection of the mucous membranes of the trachea and bronchi and surrounding tissues. The most common cause is viral or bacterial infection affecting the lower respiratory tract. Persistent inflammation can lead to this symptom. It is recommended to take antibiotic medications such as Amoxicillin capsules or Cefalexin capsules under medical supervision to prevent further progression of the disease.

4. Rheumatoid Arthritis

Rheumatoid arthritis is a systemic autoimmune disorder in which the immune system mistakenly attacks normal joint tissues, causing a series of inflammatory reactions. This may also lead some patients to experience symptoms such as fever and loss of appetite. In severe cases, persistent high fever may occur. It is recommended to take anti-rheumatic drugs such as Methotrexate tablets or Leflunomide tablets under medical supervision, which helps control the disease and improve symptoms.

5. Systemic Lupus Erythematosus

Systemic lupus erythematosus (SLE) is an autoimmune disease, often triggered by factors such as genetics or viral infections. When SLE causes immune system dysfunction or severely compromised immunity, patients may experience persistent fever, joint pain, and other symptoms. It is recommended to follow medical advice and use medications such as acetaminophen tablets or indomethacin capsules to control inflammation and provide analgesic and antipyretic treatment.

If persistent high fever occurs, it is advisable to visit a hospital for tests such as complete blood count and C-reactive protein to identify the exact cause and receive targeted treatment.