Systematic Search for Health

Before adding a subject heading to your search strategy, it is important to check the scope of the subject term to ensure that it is relevant to your topic. In EBSCOHost databases, you can find this definition by checking the Scope note.

When you explode a subject heading, the search  term is “exploded”  to include narrower terms that are indexed to that subject heading. In deciding whether it is appropriate to explode a subject heading, look at the subject term hierarchy to see if the subject terms indexed beneath it are relevant.

Note: Medline Complete (EBSCO) is supposed to explode all branches. However it only explodes the one level you can see, just like APA PsycINFO (EBSCO) and other EBSCO platform databases.

A subject heading that has been identified as a Major focus, which means that it is the main focus of the paper. Because we are interested in this topic whether it's a major theme of the paper, or not. To ensure comprehensive coverage, we will avoid using Major focus fields (eg. MM) as they would not cover all instances of the subject heading.

Combined use of subject headings and keyword searching is recommended for systematic searching for comprehensive results. Adding subject headings to your search strategy may help find relevant literature on the topic which were missed by keyword searching. Subject headings are not available on all topics, are sometimes newly added and do not cover earlier research, and new articles often have no subject headings, meaning the newest literature needs to be searched by keywords.

The subject heading is added to the database in a certain year, and only collects literature from that year onwards. So you will need to investigate the History notes for previous headings you can add to the search to cover earlier research.

*If you are searching Aboriginal or Torres Strait Islander populations please see Topic filters.

An example of this is the Medical Subject Heading "Virtual reality" which was only added to MeSH in 2018. This heading will only pick up articles about virtual reality that were written from 2018 onwards.

Subject headings also change and evolve over time because certain topics in health change name as we learn more about them.

An example of this is Autistic Spectrum Disorder. Until 2016 in order to search "Autistic Spectrum Disorder" you had to use the MeSH term "Childhood Developmental Disorders, Pervasive". Meaning that the new heading will only pick up article from 2016 to current. So you need to include both of these headings.

Each database has its own unique set of subject headings tailored to align with the database's specific discipline area. Some databases have no subject headings at all. This means that a CINAHL Subject Heading, for instance, is unlikely to appear as a subject heading in SportDiscus.

For more information on the syntax used with subject headings see Translating your search.

Subject headings are created by subject experts who work for the database vendor. Subject headings are designed to efficiently retrieve studies within the database directly related to your topic. Unlike hashtags in social media, you cannot create your own subject headings.

A common mistake is to misspell or mistype a subject heading, such as MH "Stress, Psychological". It can be easy to leave out the comma or forget whether it's MH "Sport", or MH "Sports". We strongly recommend using the built-in subject heading tool to find and collect subject headings. To prevent errors, use copy and paste to collect headings for your search strategy instead of manual typing.

If you are studying a relatively new topic, or a very narrow field of study, there may not yet be an appropriate subject heading. it is recommended that you use keywords in this case.

Whilst there may be a subject heading for a particular concept in one database, a similar one may not exist in another database. If it's an essential term or concept consider searching for it as a keyword in the other databases.

Subject headings are added manually by subject experts. This takes time. The newest articles added to a database in the last 6 months may not yet have any headings. We are now starting to see AI used to add headings to new articles, this will speed up the process, but the process is never perfect and some articles may be mislabelled.

In 2023, Medline introduced a new MeSh term to capture articles about First Nations people in Australia. This was due to user feedback that the previous subject heading was not appropriate. The new subject heading is: Australian Aboriginal and Torres Strait Islander Peoples

The new subject heading only captures literature from 2023 onwards, so to find older literature it is best to also include the former subject heading in your search, which is: Native Hawaiian or Other Pacific Islander

For support in searching for Indigenous populations from other countries, please review the relevant search filter as provided by University of Alberta.