If you do not have a period and you experience dizziness and have a history of normal sexual intercourse without contraception, it may be caused by pregnancy, because after pregnancy, estrogen will increase thousands of times, which can lead to dizziness or gastrointestinal reactions, etc. It is recommended to go to the hospital for a urine HCG test and, if necessary, a blood HCG test to find out if you are pregnant. If you are not pregnant and have a history of menopause, it is recommended to exclude dizziness caused by hypotension or hypoglycemia or cervical spine disorders. For absence of menstruation, if pregnancy is clinically planned, an early pregnancy test can be done one week apart. If there is still no menstruation, progesterone can be given orally to induce menstruation. If you are clinically pregnant after retesting, be cautious when using the medication.