Vaginal discharge is where biological fuids are contained within, or expelled from the vagina. Whilst most discharge is normal and reflect the various stages of the menstrual cycle, it can result from an infection (e.g. STD).
DDx
Physiological:
Cyclical discharge, which is thick and white, odourless. It occurs at the beginning and end of a menstrual cycle
Ovulation, where is clear and stretch. It occurs during ovulation
Amniotic fluid/Rupture of membranes, which is clear, causing vaginal pH>4.5. It occurs in pregnancy
Pathological:
Candidiasis (i.e. yeast infection), which is thick, white, lumpy
Trichomoniasis, which is copious, green, frothy
Gonorrhea, which is creamy white or yellow, odourless
Chlamydia, which is purulent, malodorous
Bacterial vaginosis, which is thin, grey or green, fishy odour
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