Is it normal to have a period for three days?

Patient's question:

Previously, my menstrual period lasted about four to five days, but this year, it ended around the evening of the third day, with a normal amount—not excessive. Is this considered normal?
Additional information: I am 25 years old, unmarried, and this is my first time experiencing this issue.
Update: I had a routine ultrasound examination in March, and there were no problems found.

Doctor's answer:

The duration of menstruation is generally 3 to 7 days, with bleeding volume ranging from 80 to 100 milliliters, peaking on the 2nd to 3rd day. Menorrhagia refers to a menstrual flow that is less than normal, often caused by blood deficiency, qi stagnation, blood stasis, cold congealing blood vessels, phlegm obstruction, or other reasons. It is generally considered that a flow of less than 30 milliliters is classified as hypomenorrhea. Menstrual irregularities refer to changes in menstruation caused by various factors, including the age of menarche (the first menstrual period), the timing of the period, cycle changes, changes in the duration of menstruation, and changes in the volume of menstruation. It is one of the most common symptoms of gynecological diseases. There are many causes of menstrual irregularities, and they are often a signal of gynecological diseases. It is recommended to seek medical attention at a regular hospital in a timely manner.

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