Schizophrenia. National Alliance on Mental Illness. https://www.nami.org/About-Mental-Illness/Mental-Health- Conditions /Schizophrenia. Accessed Jan. 18, 2024. What is schizophrenia? American Psychiatric Association. https://www.psychiatry.org/patients-families/schizophrenia/what-is-schizophrenia. Accessed Jan. 18, 2024. Schizophrenia. Mental illness, also called mental health disorders, refers to a wide range of mental health conditions — disorders that affect your mood, thinking and behavior. Risk factors Many conditions increase the risk of swollen lymph nodes. Factors that increase the risk of having these conditions include: Older age. Aging increases the risk of getting infections, immune system disorders and cancer. High-risk behaviors. Chronic conditions may increase the risk of influenza complications. Examples include asthma and other lung diseases, diabetes, heart disease, and nervous system diseases.