check up on vs check into

check up on and check into both are verbs.

Word	Noun	Adjective	Verb	Adverb
check up on	No	No	Yes	No
check into	No	No	Yes	No

As verbs, check up on and check into are synonyms defined as:

check up on and check into: examine so as to determine accuracy, quality, or condition

Other synonyms of check up on include check, check out, check over, go over, look into, suss out.

check up on (verb)	check into (verb)
examine so as to determine accuracy, quality, or condition	examine so as to determine accuracy, quality, or condition