Is it normal for menstrual blood to be dark red?

Patient's question:

Doctor,
I have a question to ask you. Is dark red normal for menstrual color, or is bright red normal? Does abnormal color indicate any illness?
Thank you!

Doctor's answer:

Hello:
A normal menstrual cycle is typically 28 days, with occasional variations of up to 9 days in advance or delay considered normal. A normal menstrual period should last 3-7 days, usually 4-5 days. The amount of menstrual flow is generally around 50-80 milliliters. Due to differences in individual constitution, age, climate, region, and living conditions, the flow may vary slightly, which is all within the normal physiological range. Normal menstrual blood is slightly dark red, starting lighter in color, gradually deepening, and then turning pale red and clean. Under normal circumstances, the texture of menstrual blood is neither too thin nor too thick, does not clot easily, has no obvious blood clots, and has no special odor.
Menstrual disorders refer to various conditions related to menstruation or the menstrual cycle, including abnormalities in the period, flow, color, texture, or odor of menstruation, or various noticeable symptoms that occur cyclically before, during, or after menstruation. If, before or at the beginning of menstruation, there are mild symptoms such as slight lower abdominal pain or lower back discomfort, mild breast tenderness, or emotional instability, but these do not affect work or daily life and disappear naturally after menstruation, this is a common physiological phenomenon and generally does not require treatment. Some young women may experience irregular menstruation in the first one or two years after menarche, with periods arriving earlier or later, or even stopping for several months. This is due to insufficient kidney qi. These women, as long as they show no obvious systemic symptoms, will naturally recover normal menstruation as their bodies mature. Additionally, women approaching or in menopause often experience menstrual irregularities, with unstable cycles, periods, flow, and texture. As long as these irregularities do not pose a threat to health or daily life,

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