english: But some studies have also found that emotional tears contain higher levels of stress hormones, such as ACTH and enkephalin, an endorphin and natural pain killer.
non_english: A nekatere študije so ugotovile, da vsebujejo čustvene solze višje vrednosti stresnih hormonov, kot je ACTH in enkefalin, endorfin in naravna protibolečinska snov.