Bubbles in menstrual blood may be caused by conditions such as vaginal laxity or inflammation. It is recommended to consult a doctor after menstruation and treat the problem under the doctor’s supervision. 1. Vaginal laxity: A loose vagina makes it easy for air to enter the vagina, and during menstruation, the cervix is in an open state and communicates with the outside world through the vagina, so it is normal to have air bubbles in the discharged menstrual blood. 2. Inflammation: Bubbles in menstrual blood are a symptom of vaginitis and pelvic inflammatory disease (PID), including abnormal vaginal discharge, vulvar itching, and lower abdominal pain, such as bacterial vaginitis and vulvovaginal pseudohyphomycosis. It is recommended to go to the hospital 3~7 days after the menstrual period to check the routine leukorrhea, gynecological examination, uterus and double adnex ultrasound, etc. Usually, pay attention to personal hygiene, keep the vulva clean and dry, and avoid cold and spicy stimulating food. There may be other problems with menstrual blood bubbles, so please visit the hospital in time and get treatment under the doctor’s guidance.