MRIs do not affect menstruation. There are many reasons that affect menstruation, such as: emotions, stress, taking certain medications, endocrine disorders (e.g. polycystic ovary syndrome, hyperprolactinemia, hyperthyroidism, etc.), and environmental factors. Menstruation is formed when the ovaries secrete estrogen and progesterone that periodically act on the endometrium, causing it to shed. MRI has a relatively high resolution for soft tissues, especially for the cranium, heart, lungs, pelvis, spine, limbs, bones and joints, etc. It is used for the diagnosis and differentiation of many kinds of diseases, and has less impact on the human body, which usually does not affect menstruation. When women have abnormal menstruation, it is recommended to go to the hospital in time. After the doctor’s interview, according to the patient’s specific situation and the results of the relevant items, the cause of the abnormal menstruation will be determined.