IFN-γ is interferon γ. High IFN-γ values may be caused by inflammation, viral infection or immune dysfunction. 1. Inflammation: IFN-γ can be secreted and produced by a variety of cells under a series of severe inflammatory conditions, such as dendritic epidermal γδ T cells, keratinocytes, peripheral blood γδ T cells, mast cells, neurons, CD8+ T cells, macrophages, B cells, neutrophils, natural killer cells, CD4+ T cells and testicular spermatogonia, etc, and released, resulting in high levels of it. 2. Viral infection: IFN-γ itself has antiviral function, so especially when the new anti-HIV protein PSGL-1 becomes more abundant, the content of human body’s antiviral natural immune component IFN-γ will increase. 3. Immune dysfunction: when the body’s autoimmune hyperfunction, allergy or hypersensitivity, metabolic abnormalities, will cause high IFN-γ value. Should enter the hospital for further examination, in order to confirm the diagnosis, and active treatment, in order to avoid delaying the disease.