The most common clinical symptom of endometrial polyps is vaginal bleeding, which manifests in the following ways: Some women may experience heavy menstrual flow with a large amount of blood clots. This is because most patients with endometrial polyps have excessive proliferation of the endometrial lining. When this excessively proliferated endometrium sheds during menstruation, it can result in a heavier flow. Additionally, some women may experience vaginal bleeding after their menstruation has ended. Typically, this bleeding is not heavy and is dark red in color. This could indicate the presence of endometrial polyps.