If else statment and switch statement about condition of element value

I'm doing a if else and switch statement's comparison using javascript and jquery library. It is about classification of body mass index and each classification output different suggest diet. Both statements can't run and I can't catch the problem.

This is classification of body mass index:

const underweight = "underweight"
const healthy = "healthy"
const overweight = "overweight"
const obese = "obesity"
const obeseI = "obese Grade I"
const obeseII = "obese Grade II"
const obeseIII = "obese Grade III"

$(".underweight").hide();
$(".normalweight").hide();
$(".overweight").hide();

This is an if else statement:

if ( $(".Classification").val() == underweight ){
    $(".underweight").show()

}else if ( $(".Classification").val() == healthy ) {
    $(".healthy").show()

}else if ( $(".Classification").val() == obese 
        || $(".Classification").val() == obeseI 
        || $(".Classification").val() == obeseII 
        || $(".Classification").val() == obeseIII){
    $(".overweight").show()
}

This is switch statements:

switch ($(".Classification").val()){
case underweight:
    $(".underweight").show();
    break;

case healthy:
    $(".normalweight").show();
    break;

case overweight:
case obese:
case obeseI:
case obeseII:
case obeseIII:
    $(".overweight").show();
    break;

default:
    $("ul").hide()

}