What to expect from meditation?
Is it just something to notice, and let pass? Is it a symptom of something and/or, is there anything to do about it?


Treat the object according to your practice, i.e. for

Samatha meditation: 


when mind wanders, bring it back to the breath.


Vipassana meditation: 


every object is treated in the same way, there is no discrimination, i.e. no object is more or less important than the other. Note the object and return to the rising and falling of the abdomen.