Light vaginal itchy clear white discharge with no odor. What is it?

Different reasons. Vaginal discharge could be due to many things. You need evaluation by your pmd. This could be std like: trichomonos (usually frothy discharge) & chlamydia (clear d/c), bacgterial vaginosis (white, fish odor). Yeast usuaslly thicker curdy d/c. Occasionally this will be physiologic (normal) discharge depending on you menstrual cycle.