[list of medivcal conditions followed by:]
Contact your doctor or health care provider right away if any of these apply to you.
Correct? Or would this be better:

Contact your doctor or health care provider right away if any of these applies to you.

Thank you for answering!

The grammar world hasn't really sorted itself on this one yet. You can use both. In other words, you can say "any of them is" or "any of them are". The latter is far far more common.

In short, you can't get it wrong. Any is both singular and plural. If your sense is strongly "any [one] of them is", you could go singular, otherwise go plural if I were you.

Thank you very much!