Which is said in Chinese Medicine. Easy to understand, since from nature we've seen the plants nurtured by water, analogous to human blood, which could provide nutrients for the whole organism. So when the hair growth is stunted, or frequent hair loss happens, we would suspect the source's been "altered", namely nutrients are not enough. That's the endogenous cause. But also it could be that some external forces cause it. But what could be the exogenous culprit? We never see any "bugs" or threats there except the hairs itself. Then what if it's possible that the "threat" does exist, just that it's so small that our eyes cannot see? --

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