The red sticky leucorrhea is caused by blood in the leucorrhea, only the blood content is less and diluted by the leucorrhea, so it does not look like blood to the naked eye, but it is actually still because the leucorrhea contains red blood cells. The causes of red sticky leucorrhea are physiological and pathological. 1, physiological reasons: women in the menstrual period or ovulation, because of endocrine reasons, resulting in the shedding of the endometrium, there will be menstrual blood outflow, leucorrhea on the red mucus leucorrhea, because of the small amount of bleeding, the naked eye can not see the red liquid, mistakenly not containing blood caused by the actual leucorrhea containing red blood cells, which is normal This is a normal physiological manifestation, no need to worry too much. Another part of women placed in the uterus birth control ring, when the birth control ring abnormalities, will also cause red mucus leucorrhea, if the red mucus leucorrhea lasts for a long time, it is recommended to immediately consult a doctor; 2, pathological factors: women mixed with a small amount of blood in the leucorrhea, may be the uterus, cervical opening, vagina, adnexa and other abnormalities caused by the occurrence of inflammatory vaginitis, cervical erosion and other diseases, or with uterine mucosal fibroids, the Cervical cancer, cervical polyps and other diseases, due to the infiltration of inflammatory cells, or the infiltration of cancer cells, resulting in infection, bleeding, pain and other symptoms, there will be a discharge with red, red discharge and leucorrhea combined to form a red mucus leucorrhea, if the condition is serious should promptly seek medical attention.