…and wondered, “What’s wrong with me?” Well, nothing. But you are more likely than men to tear up for random reasons. According to the book Why Only Humans Weep, emotional tears are triggered by prolactin. And women naturally have more prolactin than men, because it triggers milk production after a baby is born. But even if you’re not pregnant or a mom, you still have higher levels of prolactin, making you more prone to crying.