If the patient has a continuous fever for 5 days, the following factors should be taken into consideration:1. The most common factors are infectious factors, such as bacterial, viral, mycoplasma, and fungal infections will have a continuous fever for more than 5 days, when the fever is variable and usually ranges between 38-40℃.2. Non-infectious factors can also lead to a continuous fever for 5 days, and the non-infectious factors will appear as a continuous fever with moderate heat type and low heat type. 3. Non-infectious factors such as tuberculosis, rheumatic and immune system diseases such as dermatomyositis, connective tissue disease, rheumatoid arthritis, or systemic lupus erythematosus can cause continuous fever for 5 days, and non-infectious factors such as moderate and low fever can cause continuous fever for 5 days. 3.