Slight bleeding in mid-pregnancy is usually the result of miscarriage, cervicitis, cervical polyps, vaginitis and other diseases. 1. In mid-pregnancy, over-exertion or abdominal compression often leads to pre-miscarriage. The patient will usually have light vaginal bleeding, which will stop soon if the condition is mild. 2. If a woman in mid-pregnancy suffers from cervicitis, due to the irritation of the mucous membrane of the cervix, sometimes there will be a small amount of bleeding, if the mucous membrane is not seriously irritated, the bleeding will stop soon. 3. If a pregnant woman has cervical polyps, the blood vessels on the surface of the polyp tissue may rupture and cause a small amount of bleeding. 4. If a woman in mid-pregnancy suffers from vaginitis, she may have a small amount of bleeding due to inflammation of the vaginal mucosa. Damage to the vaginal mucosa caused by inflammatory stimulation is usually not serious, and the vaginal bleeding will stop soon.