  Knowledge graphs that encapsulate personal health information, or personal
health knowledge graphs (PHKG), can help enable personalized health care in
knowledge-driven systems. In this paper we provide a short survey of existing
work surrounding the emerging paradigm of PHKGs and highlight the major
challenges that remain. We find that while some preliminary exploration exists
on the topic of personal knowledge graphs, development of PHKGs remains
under-explored. A range of challenges surrounding the collection, linkage, and
maintenance of personal health knowledge remains to be addressed to fully
realize PHKGs.
