About: http://webisa.webdatacommons.org/72072124

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	They may see light flashes, blind spots, zigzag lines, shimmering lights and may experience vision loss and numbness prior to the head pain and other symptoms.
http://www.w3.org/ns/prov#wasQuotedFrom	headaches.org