What Causes Vaginal Bleeding?

Vaginal bleeding refers to bleeding from the genital tract occurring outside of normal menstruation or postpartum lochia. It may originate from the vulva, vagina, cervix, or endometrium—with uterine sources being the most common. Vaginal bleeding is a frequent symptom of gynecological disorders. Its manifestations include menorrhagia (excessively heavy menstrual bleeding), prolonged menstrual periods, irregular bleeding, or contact bleeding (e.g., after intercourse). So, what causes vaginal bleeding? Below, we address this question.

What Causes Vaginal Bleeding?

1. Cervical Erosion

Cervical erosion is a common condition among women. Contributing factors include intrauterine device (IUD) use, poor personal hygiene, unhygienic sexual practices, and having multiple sexual partners—thus warranting appropriate attention and preventive measures. Additionally, vaginal bleeding may result from threatened abortion, incomplete abortion, ectopic pregnancy, placenta previa, placental abruption, hydatidiform mole, or choriocarcinoma.

2. Genital Infections and Inflammation

Neglecting personal hygiene in daily life may lead to conditions such as vaginitis, pruritus vulvae, or vaginal ulcers. More severe cases may involve acute or chronic cervicitis or cervical polyps—all potential causes of vaginal bleeding. Moreover, vaginal bleeding can also occur secondary to systemic diseases including hepatic disorders, aplastic anemia, immune thrombocytopenic purpura (ITP), leukemia, or obstetric/gynecologic complications associated with disseminated intravascular coagulation (DIC).

3. Hormonal Fluctuations

Minor vaginal bleeding during ovulation—typically brief and self-limiting—generally requires no specific treatment. This phenomenon is commonly linked to transient declines in estrogen levels around ovulation, leading to partial shedding of the endometrium and resultant spotting. Nevertheless, individuals experiencing such symptoms should consult a qualified healthcare provider for further evaluation to avoid delayed diagnosis or management.

Knowledge Extension: Vaginal Care Tips During Menstruation

1. Maintain Proper Hygiene

A healthy vagina hosts numerous beneficial bacteria, particularly lactobacilli, which help maintain its pH within the slightly acidic range of 3.8–4.2. Most pathogenic bacteria thrive only at pH levels above 4.5. Thus, preserving this optimal acidic environment helps protect against infection. However, during menstruation, hormonal fluctuations—especially changes in estrogen—alter vaginal pH, weakening this natural acidic defense and increasing alkalinity, thereby reducing resistance to external pathogens and raising infection risk.

2. Appropriate Cleansing Practices

Avoid using shower gel or body wash to cleanse the external genitalia during menstruation. Many women mistakenly believe that using these products eliminates odor—but doing so significantly increases the risk of vaginal itching and infection. Likewise, avoid washing the genital area with excessively hot water. Most shower gels are alkaline, whereas a mildly acidic environment best supports vaginal health. No specialized cleansing agents are necessary.

The above outlines the primary causes of vaginal bleeding. We hope this information is helpful to you.