MicroRNAs are secreted into various bodily fluids which can be altered by disease states. Current studies are attempting to utilize microRNAs in these fluids for diagnostic and prognostic value. Examples are listed in this diagram: cerebrospinal fluid, Alzheimer’s disease1; vitreous humor, ocular diseases2; saliva, esophageal cancer3; blood, cardiovascular disease4; bile, cholangiocarcinoma5; gastric juice, gastric cancer6; pancreatic juice, pancreatic cancer7; urine, renal fibrosis8; fecal matter, colon cancer9; synovial fluid, Rheumatoid arthritis10.