<a class="localLink" href="http://schema.org/HealthTopicContent">HealthTopicContent</a> is <a class="localLink" href="http://schema.org/WebContent">WebContent</a> that is about some aspect of a health topic, e.g. a condition, its symptoms or treatments. Such content may be comprised of several parts or sections and use different types of media. Multiple instances of <a class="localLink" href="http://schema.org/WebContent">WebContent</a> (and hence <a class="localLink" href="http://schema.org/HealthTopicContent">HealthTopicContent</a>) can be related using <a class="localLink" href="http://schema.org/hasPart">hasPart</a> / <a class="localLink" href="http://schema.org/isPartOf">isPartOf</a> where there is some kind of content hierarchy, and their content described with <a class="localLink" href="http://schema.org/about">about</a> and <a class="localLink" href="http://schema.org/mentions">mentions</a> e.g. building upon the existing <a class="localLink" href="http://schema.org/MedicalCondition">MedicalCondition</a> vocabulary.