What factors can cause a decrease in menstrual flow?

Patient's question:

During this period, I have been preparing for the postgraduate entrance exam, but I don't feel much pressure, and the previous ones were all normal. This time, the amount suddenly decreased.
A few days before my period, I got sick—some cold symptoms and tonsillitis. This is a common occurrence for me, and it has never affected me before.
Also, between these two periods, I took an emergency contraceptive pill, called Postinor, I think. But they said it has no effect on the body.
How can women know if their kidneys are healthy? How should they supplement them?

Doctor's answer:

Hello: Based on the situation you described, your condition should be fine. Don't worry. Focus on positive personal menstrual care and enhance your nutrition.
Regarding kidney deficiency:
- Kidney Yang deficiency symptoms include lower back pain, cold limbs, aversion to cold, and even edema, which manifest as "cold" symptoms. Poor sexual function can also lead to kidney Yang deficiency.
- For dietary supplements, you can consume dog meat, lamb, chives, and loach. Medicinal options include Shenbao (Kidney Treasure), Yurong (Tribulus Terrestris), Jinkui Shenqi Wan (Golden Cabinet Kidney Qi Pill), and Yougui Wan (Right Returning Pill).
- Kidney Yin deficiency symptoms are characterized by "heat," including lower back pain, dry heat, night sweats, spontaneous sweating, dizziness, and tinnitus.
- For dietary supplements, you can consume black sesame seeds, black fungus, black sesame, and small walnuts. Medicinal options include Zuoyuan Wan (Left Returning Pill) and Liuwei Dihuang Wan (Six-Flavor Rehmannia Pill).

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