What causes recurrent high fever?

High fever is a symptom of high body temperature, and common causes fall into two main categories: infectious diseases and non-infectious diseases.

1. Infectious Diseases:

1.1 Ordinary infections

This refers to the body being infected by common viruses or bacteria, such as influenza virus, Staphylococcus aureus, Streptococcus pneumoniae, etc., leading to diseases including respiratory, gastrointestinal, and urinary tract infections. These infections can cause high fever, and as long as the infection persists, episodes of high fever will recur.

1.2 Tuberculosis infection

This often leads to tuberculosis, most commonly pulmonary tuberculosis. The typical symptoms include recurrent fever and night sweats.

1.3 Special infections

These include fungal or mold infections, as well as multidrug-resistant bacterial infections. Patients with these infections often experience persistent high fever, and the illness tends to have a prolonged course.

2. Non-infectious Diseases

2.1 Rheumatic and autoimmune diseases

These include rheumatoid arthritis, rheumatic arthritis, systemic vasculitis, and systemic lupus erythematosus.

2.2 Tumor-related diseases

Common examples include lymphoma, hematologic tumors, lung tumors, liver tumors, etc., which may present with such fever symptoms.

2.3 Other conditions

For example, brain injury or heatstroke can easily disrupt the function of the body's temperature regulation center, leading to the aforementioned symptoms.

In addition, allergies or certain medications may also cause abnormal body temperature.