Trichomonas vaginitis does not usually cause low menstrual flow. The main causes of low menstrual flow are as follows: psychological factors, endocrine disorders, abnormal uterine morphology, thyroid dysfunction, hyperprolactinemia, oral contraceptive pills or antitumor drugs, and low menstrual flow can also occur during perimenopause. Trichomonas vaginitis is caused by Trichomonas vaginalis infection, which is mainly transmitted by sexual contact, or vertically, as in vaginal delivery. According to Trichomonas vaginitis guidelines Trichomonas has now been isolated from the vagina, cervix, urethra, paraurethral glands, bartholin glands, bladder, and fallopian tubes. Based on the above two points it is clear that Trichomonas vaginitis does not affect the menstrual flow. If you suffer from the above disease, it is recommended that the hospital standardized diagnosis and treatment, under the guidance of the doctor to use medication, not self-medication, so as not to avoid misunderstanding the condition.