STRESS AND ANXIETY: Stress can affect your regular period cycle and sometimes make you bleed twice a month, that too, in a short span of time. Stressful situations make your mind and body work overtime. In some scenarios, women may not bleed for a month or two and in other cases, they may bleed more than once a month. Other causes of abnormal menstruation include: Uterine cancer or cervical cancer. Medications, such as steroids or anticoagulant drugs (blood thinners). Medical conditions, such as bleeding disorders, an under- or overactive thyroid gland, or pituitary.