 A true evaluation of gynecomastia has some tests that we run to make sure that it's not other reasons. 75% of it is idiopathic. That means we don't know what happens. It's just due to hormonal changes. Sometimes it could be due to your thyroid, your testes, you have prolactin tumors, or you have other germ cells or testicular germ cell tumors, but most of the time 75% of the time it's idiopathic. There's no reason behind it. It's probably related to hormones. Some medications that cause gynecomastia, a lot of men are on propitia these days for hair loss. Steroids is indefinite. People that use steroids to build up muscle or have done cycles in younger ages, that could be the cause. Anti-anxiety medications such as volume, anti-depressant, antibiotics. So there's a whole slew of medication that can cause gynecomastia. Substances that can cause alcohol and marijuana. Yes, since marijuana is legal it should be brought up that it has been known to cause gynecomastia and I've seen plenty of it here in Los Angeles and Beverly Health Conditions. As we talked about some stuff with your gonads, your aging tumors, thyroid, kidney failure, liver failure, malnutrition.