it's at times difficult to function; I have been incredibly tired because of the near constant bleeding; my cycle has become increasingly more erratic, first occasional spotting between periods, most of March 2022 I was bleeding (two periods and breakthrough bleeding), and then less than two weeks after my cycle in March ended; my cycle has become increasingly more erratic, first occasional spotting between periods, most of March 2022 I was bleeding (two periods and breakthrough bleeding), and then less than two weeks after my cycle in March ended; This spontaneous case was reported by a consumer and describes the occurrence of MENSTRUAL DISORDER (my cycle has become increasingly more erratic, first occasional spotting between periods, most of March 2022 I was bleeding (two periods and breakthrough bleeding), and then less than two weeks after my cycle in March ended), INTERMENSTRUAL BLEEDING (my cycle has become increasingly more erratic, first occasional spotting between periods, most of March 2022 I was bleeding (two periods and breakthrough bleeding), and then less than two weeks after my cycle in March ended), MOBILITY DECREASED (it's at times difficult to function) and FATIGUE (I have been incredibly tired because of the near constant bleeding) in a 39-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination.     Never had the kind of issues with Menstrual cycle patient experienced since vaccine.  Concurrent medical conditions included Hashimoto's disease (unmedicated as T levels were in range) since 2019.    On an unknown date, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 18-Apr-2021, the patient experienced MENSTRUAL DISORDER (my cycle has become increasingly more erratic, first occasional spotting between periods, most of March 2022 I was bleeding (two periods and breakthrough bleeding), and then less than two weeks after my cycle in March ended) and INTERMENSTRUAL BLEEDING (my cycle has become increasingly more erratic, first occasional spotting between periods, most of March 2022 I was bleeding (two periods and breakthrough bleeding), and then less than two weeks after my cycle in March ended). On an unknown date, the patient experienced MOBILITY DECREASED (it's at times difficult to function) and FATIGUE (I have been incredibly tired because of the near constant bleeding). At the time of the report, MENSTRUAL DISORDER (my cycle has become increasingly more erratic, first occasional spotting between periods, most of March 2022 I was bleeding (two periods and breakthrough bleeding), and then less than two weeks after my cycle in March ended), INTERMENSTRUAL BLEEDING (my cycle has become increasingly more erratic, first occasional spotting between periods, most of March 2022 I was bleeding (two periods and breakthrough bleeding), and then less than two weeks after my cycle in March ended), MOBILITY DECREASED (it's at times difficult to function) and FATIGUE (I have been incredibly tired because of the near constant bleeding) had not resolved.        mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosing remained unchanged.       No concomitant medications were provided.  The patient had no known allergies.  The patient had surgery to for diagnostics.  No treatment medications were provided.