Why do the left breast feel swollen and painful before menstruation?

Patient's question:

Detailed medical condition and consultation purpose: Why do I have slightly sore and in my left breast before menstruation? My child was weaned in October 2005 when they were just one year old. Previously, I had never experienced any discomfort. Last month, before my period, I had slightly sore and in my left breast, but there was no reaction on the right side. It wasn't very painful—just mild. The pain stopped after my period arrived. It's the same this month—I'm feeling a bit sore again, and I think my period might be coming. Last month's period arrived at the end of the month, and my periods often delay by a few days. Is this normal?

Doctor's answer:

Hello: Based on your situation, it could be considered as premenstrual syndrome (PMS). The symptoms of PMS include headaches, dizziness, insomnia, fatigue, mood swings, breast tenderness, facial swelling, among which mood instability is the most prominent. Mild cases may be quiet and melancholic; severe cases may be irritable, easily agitated, and prone to sudden anger over minor inconveniences. In addition to avoiding overwork and stress, you can relieve negative emotions by listening to cheerful music or watching humorous works. Additionally, you can supplement with complex B vitamins and oryzanol. It is recommended to maintain a light diet and reduce the intake of sugary foods.

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