Affording medical treatment certainly isn't just a first world problem.

Affording US style comprehensive fancy coverage is a first world problem.

The various types of free "low quality" (by US standards) medicine available in the US are far better than what you get in much of the third world.

Not having medical treatment and not having access to education are very real third world problems.

Despite what the media show in their humanitarian segments, the third world is vast, and third world problems are not just of the kind: no access to water, famine and/or civil war.