When the solid has a high affinity for water - in which case it is called hydrophilic (high energy e.g. glass)- water spreads. In the opposite case of hydrophobic (low energy e.g. teflon) surfaces, water does not spread but, instead, forms at equilibrium a spherical cap resting on the substrate with a 'contact angle'.
Infections such as trichomoniasis, gonorrhea, and Chlamydia (all STDs); and yeast infection can all cause vaginal discharge. Vaginal discharge can be associated with other symptoms such as burning or itching. Antibiotics are given for infections that cause vaginal discharge.
I have experienced cramping in my lower stomach; similar to one that have in pms. As I was not due to, I wonder what it could mean. When I noticed vaginal discharge that was yellow in colour, I have started to suspect on genital infection. Which std is associated with cramping and vaginal discharge?