Chest discomfort, menstruation delayed for 6 days and still hasn't arrived, I use

Patient's question:

Chest discomfort, menstruation delayed for 6 days and hasn't arrived yet. I used a pregnancy test and it was negative. What could be the reason? Please help the expert explain this, thank you

Doctor's answer:

Guidance: It is normal to experience breast tenderness and pain in the early stage. Patients usually experience breast or nipple tenderness, sometimes even to the point of being unable to touch clothing, with a feeling of hardness upon palpation, 7 to 14 days before menstruation. Don't worry, it will return to normal after menstruation. If not, it is recommended to switch to low-fat dairy products, as bran can help boost energy. Consuming whole grains, fruits, and vegetables can increase fiber intake. Try to avoid alcohol and reduce sodium intake. Celery is diuretic, vitamin E can alleviate symptoms of fibrocystic disease, and vitamin A can reduce pain. Doctor's inquiry: