Hi, i have had a continuous flu for almost a year now and i have tried to get medication but it doesn't seem to go away. what can be the cause?

Not the flu: Influenza infection does not last or intermittently recur for several months. Persistent flu-like symptoms are likely caused by a problems with the immune system (immunodeficiency, rheumatological problem, or types of cancers). A complete physical with testing of your body systems is necessary to determine the cause of these symptoms.