NK cells, also known as natural killer cells, belong to the lymphocytes.NK cell increase can be seen for a variety of reasons, if simply mildly elevated, no other manifestations, can continue to maintain observation. If it is accompanied by infections, rheumatic diseases and other pathologic conditions, the main cause of treatment, such as the use of penicillin and other drugs to treat infections. NK cells mediate the natural immune response, that is, without relying on antibodies and complement, can directly kill the target cells. increased NK cells, most commonly seen in a variety of infections, such as bacterial, viral, fungal infections, need to target different pathogens to carry out the appropriate anti-infective treatment, such as fungal infections using antifungal drugs fluconazole, itraconazole, etc.. Various immune diseases, such as systemic lupus erythematosus, multiple sclerosis, rheumatism and malignant tumors, can also cause nk cell increase, according to the doctor’s guidance to further improve the examination, give the corresponding immunosuppressant or anti-tumor drug treatment. Such as systemic lupus erythematosus, need to use prednisone, cyclosporine and other drugs for treatment. NK cell elevation, it is recommended to go to the hospital for examination, clear cause of the disease, under the guidance of the doctor for regular follow-up observation or standardized treatment, do not blindly deal with their own, so as not to delay the course of the disease.