Chronic recurrent fevers in the elderly can lead to progressive deterioration of body functions and nutritional status, and the primary disease causing the fever may impair organ function. Diseases such as tuberculosis, lymphoma, and bacterial infections (e.g., recurrent acute exacerbations of chronic obstructive pulmonary disease) may cause chronic recurrent fevers in the elderly, leading to fatigue and loss of appetite, which significantly affects the patient’s nutritional intake, resulting in wasting and a significant decline in physical status. Primary diseases may progress gradually leading to organ function damage. Tuberculosis and lymphoma can cause chronic consumption of the organism, and can also invade the bone marrow to affect the hematopoietic function of the bone marrow, thus leading to anemia, reduction of white blood cells and platelets, and in severe cases, severe infections, intracranial hemorrhage and other serious complications can be secondary. Chronic obstructive pulmonary disease in acute exacerbation, may appear fever manifestation, this kind of patients lung function is obviously impaired, may be secondary to pulmonary heart disease, the patient may appear obvious dyspnea, chest tightness and other symptoms, activity tolerance is obviously reduced, so that the patient’s quality of life is obviously reduced. It is recommended that patients seek timely medical treatment, according to the specific condition to improve the relevant examination to clarify the cause of fever, and then target the cause of the treatment.