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Yellow Awareness ribbons have been known to represent the following causes, but is not limited to this list.
Adenosarcoma
Bladder Cancer - (Also see: Purple, Blue and Marigold ribbon below)
Bone cancer / Osteosarcoma
Craniofacial Acceptance (CCAKids.org)
Endometriosis awareness
Ewings Sarcoma
Hydrocephalus
Liver Cancer
Liver Disease
Microcephaly
Missing Children
Myxoid Liposarcoma
Osteosarcoma
Obesity
Sarcoma
Spina Bifida
Suicide Prevention (Also see Blue/Purple - Teal/Purple - Turquoise/Purple ribbon)