As nouns the difference between issues and concerns
is that issues is plural of lang=en while concerns is plural of lang=en.
As verbs the difference between issues and concerns
is that issues is third-person singular of issue while concerns is third-person singular of concern.
issues
English
Noun
(head)
Verb
(head)
(issue)
----
concerns
English
Noun
(head)
Verb
(head)
(concern)