The Wikipedia special page "Related changes" uses a list of page links to follow, similar to a User's watchlist. The relevant Medicine pages are listed in the pages below. They are bigger than a regular page but since the Special page uses them, the list doesn't have to be upoaded to your browser. The Special page only sends the list.
WARNING: Big and slow pages ahead. Below are the subpages with the actual list of WP:MED pages. They can be very big and very slow to load, containing 10,000 to 30,000 page links. They are intended for the faster WP:RELC to do the job. Now that you know this, you can open pages as you like.