Ever fake sick when you were younger? 10% of kids today try to fake it at some point during their scholastic careers. It’s easy: pressing that thermometer to a warm lamp gives any little trickster a convincing “sick temperature” (anything over 101.4 is the standard) – and let’s not even get started on the various sources for fake vomit. But cunning as your kid may be, it’s important for you to know the difference between faking sick and genuine illness, because both can be cause for concern.