 [ Symptoms ] does soy milk cause gynecomastia man boobs  my son is lactose intolerant and drinks a lot of soy milk as he is a growing teenager someone told him it was like estrogen and would give him man boobs is this true  thank you [ Disease ] this is adolescent gynecomastia caused by his hormones i see it every day in my practice that has a large population of teenagers it is not the soy milk it is his ranging hormones use both words adolescent gynecomastia in your search engine and you will find plenty of information very common temporary can last a few years thought i have only had one patient in 40 years that eventually needed surgery the rest self resolved hidden under a shirt for a few years