Is it normal for a 40-year-old woman to have her period one week early, especially if she hasn't visited a hospital?

Patient's question:

In the past six months, my period has come one week early every time, and it's usually clean for about 19 days in the middle.

Doctor's answer:

It may be caused by irregular menstruation. Medications such as Wuzhi Baifeng Pill and Tiao Jing Granules should be taken orally. Avoid spicy food, alcohol, and cold foods during the day. If the effect is not good, hormone tests and ultrasound examinations have been done at the hospital.