Dr. Dhivya R, an obstetrician and gynecologist at Kauvery Hospital Electronic City (Bengaluru), highlights five red flags during periods that warrant attention. These include severe period cramps, abnormal color and consistency of menstrual blood, heavy flow lasting more than 7 days, irregular periods beyond adolescence, and missed periods due to various factors like stress, PCOS, or pregnancy. These signs may indicate underlying health issues such as fibroids, hormonal disturbances, anemia, fertility issues, or even cancer, requiring medical evaluation and intervention.