Cain flew Tuesday to Florida, where he will be examined by Andrews. Cain, who has been on the disabled list since July 21 due to inflammation in his pitching elbow, will rejoin the team in New York on Friday.
San Francisco manager Bruce Bochy said having Cain get evaluated by Andrews is a precautionary move. He added that surgery has not yet been discussed.
Cain (2-7) has struggled all season. The one-time ace has a 4.18 ERA and has not pitched since July 9, when he went six innings to beat the Oakland Athletics.
The Giants last week acquired pitcher Jake Peavy from Boston for two minor league prospects.