Dear thread owner
I want to help but be patient with the language I'm gonna use.
PID stands for Pelvic inflammatory diseases. Actually is a syndrome caused by wide range of microorganisms including protozoa, fungal and bacteria that affecting female reproductive organ.
The infection could transcends from the cervix, uterus up to the fallopian tubes that carries female eggs from the ovaries to be uterus. So any infection in that course account for PID.
This infection could presents with variety of signs and symptoms such lower abdominal pain, per vaginal discharge, Pain during sex, back pain , irregular menses, severe pain during menses and infertility. In pregnant women PID may lead to miscarriage.
So this is the brief explanation of what PID is!! But to answer your last question please take this note
It's normal for women in reproductive age to have changes of the viginal secretions along the monthly circle, (usually is slippery and painless) however, any discharge associated with the above mentioned signs and symptoms should raise your suspicion regarding PID.
The discharge produced in the vigana when you have PID usually is thicker and yellowish like color or whitish and cud like (maziwa mgando) and may having bad smell. The later description is More talling to candidiasis a form of vaginal fungal infection.
Kind regards
It's me pureman