Question

why do adolescents experience mood swings

Answer 1

this happens because at this hormones development take place at a large scale this tends mood swings.

hope this helps

Answer 2

During puberty sex hormones could be the main reason for the mood swings... as they cause some physical changes.. which may indirectly cause change in our sense of behavior.. and when we are getting used to it we have the moodiness or mood swings as you say