Very thick dark brown "strings" on day 5 of period. Never had this before. Nothing appears on pad. Odorless. What does this mean? No STI.

Variation in the. menstrual flow. If not associated with any other symptoms probably normal. I hope this helps. If you do have more questions or other concerns kindly contact with me on my Virtual Practice at : www.healthtap.com/dryetimyan.