Lymphocytes are a type of white blood cell and are produced by the lymphoid organs. The normal range of absolute value of lymphocytes is (1.1-3.2) × 10^9/L, which is about 20-30% of the total white blood cells, and is usually at risk when lymphocytes are below 10%. Lymphocytes are one of the important components of the immune system and have the function of recognizing and removing pathogenic microorganisms, which can prevent the occurrence of infections. If lymphocytes are below 10%, the body’s immunity may be reduced, which leads to viruses and bacteria that can invade the body more easily and cause harm. When the body’s lymphocytes are low, due to the decrease in immunity, patients may experience weakness, fever, anemia, cough, coughing and other related symptoms. Patients are advised to go to the hospital in a timely manner and undergo relevant examinations under the guidance of a doctor to clarify the cause of the disease and then treat the cause, so as not to delay the disease and endanger the health of patients. In addition, when patients have low lymphocytes, they should be alerted to the occurrence of acute granulocytic leukemia or chronic granulocytic leukemia. If necessary, bone marrow aspiration can be performed to clarify the diagnosis and provide targeted treatment. In addition, in daily life, we should also pay attention to more rest, avoid straining and staying up late, eat less spicy and stimulating food or coffee and tea and other stimulating drinks, quit smoking and alcohol, eat more fresh green vegetables and fruits, and strengthen physical exercise to improve physical resistance.