[HealthTopicContent](http://schema.org/HealthTopicContent) is [WebContent](http://schema.org/WebContent) 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 [WebContent](http://schema.org/WebContent) (and hence [HealthTopicContent](http://schema.org/HealthTopicContent)) can be related using [hasPart](http://schema.org/hasPart) / [isPartOf](http://schema.org/isPartOf) where there is some kind of content hierarchy, and their content described with [about](http://schema.org/about) and [mentions](http://schema.org/mentions) e.g. building upon the existing [MedicalCondition](http://schema.org/MedicalCondition) vocabulary.