what causes a yeast infection? How do i get rid...

Hi,
Welcome to ehealthforum,
Vaginal infection can be caused due to changes in hormonal levels affecting vaginal secretion pH, introduction of infection through intercourse/masturbation, re-infection etc. The symptoms that you describe suggest possibility if infection. Do not ignore your symptoms. Visit your doctor/gynecologist at the earliest for examination and vaginal swab/smear test done on the discharge to help identify causative agent and get you started on appropriate treatment to help you control the symptoms. Avoid vaginal douching, or use of harsh soap or perfumes in the area. Use loose cotton undergarments and avoid use of tight fitting clothes. Avoid sweat accumulation in the area, and keep the area clean and dry. Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest. Maintain healthy diet and lifestyle. If infective cause is detected, and if you are sexually active, get your partner also treated simultaneously to prevent chances of re-infection, and avoid having intercourse while being on treatment.
Take care.