The pain you don't always call in sick for

Once a month, millions of women across the globe wake up knowing the day ahead will be shaped by the discomfort or pain of menstruation.

Menstrual cramps can range from a dull ache to debilitating pain, severe enough to force a person to miss work or classes.

Yet many women still feel the expectation to carry on as if nothing is wrong.

While South Korea is among a relatively small number of countries that legally recognize menstrual leave, many women say taking it remains far easier in theory th ...