What Remains After the Bleeding
The short answer
After childbirth, people count the days — three weeks, a hundred days — so why does the monthly period get no count of days at all? Looked at as what the body is doing, both are the same work: filling back what went out. The bleeding itself is over in a few days, but refilling continues long after — hemoglobin can read normal while stored iron is still down. If a period lasts more than seven days or comes on in a flood, a gynecological check should come first.
Contents
After giving birth, the days get counted. People speak of three weeks, or a hundred days, and those around you tell you not to overdo it during that time.
The days experienced every month get no such count. Once it ends, it is treated as finished.
Only one side has a count of days attached to it. Looked at as work the body is doing, the two sit on the same line. Filling back what went out. They differ only in scale and in how long they take.
The Time It Takes to Refill Differs From the Time It Took to Lose
In this study, 500 mL was donated at once, and the monthly loss is far smaller than that. What is worth noting here is not the amount but the time. Losing blood is over in a matter of days; refilling it continues for a long time after.
There Is More Than One Thing to Refill
The body makes new what it lost. Red blood cells are made in the bone marrow, and making them takes iron. Stored iron goes there first. So the stored side is the last to be refilled.
Rebuilding the uterine lining where it fell away also begins in those same days. This part is meant to finish within the following month.
The body is doing several things at once over the same days, and each finishes at a different time. One finishing does not mean the rest have finished.
Even When Tests Come Back Normal, Stores Can Still Be Low
The idea of iron being stored may sound unfamiliar. The body does not use all the iron that comes in; it holds some of it back in several places, including the liver. The rest is split between carrying oxygen and traveling through the blood.
So hemoglobin alone cannot tell you about the state of the reserve. The two numbers do not point to the same moment. If hemoglobin has dropped, the reserve had already been shrinking for a while before that; and hemoglobin reading normal does not mean the reserve is also ample.
There is a separate number for the reserve as well — ferritin, the protein that holds iron in storage, and its level tracks the amount stored. However, it can also rise when there is inflammation in the body regardless of how much is stored, so this number alone cannot tell the whole story either.
The Next Month Arrives Before the Refilling Is Done
The monthly bleeding is not a single, one-time event. So time itself becomes part of the accounting.
If the refilling finishes within one cycle, the next month starts from a filled state. But the time it takes to refill the reserve can be longer than one cycle. Then the next month arrives before the filling is complete.
One month's worth does not show. You meet the next month slightly short, and the month after that slightly short again. Only after this continues for a long stretch does hemoglobin fall. What remains in the body at that point is not the few days of last month but the time that has built up before it.
This does not happen to everyone. Some fully refill every month before the next one arrives; for others, one short month follows another. How much goes out, how much comes in, and the time in between together decide this. Looking at only one of them hides the rest.
After Childbirth, There Is One More Place Losing Out
Childbirth is a large, one-time loss. And it does not end there.
Fairly independent of how much you eat, about 200 mg of calcium goes out in breast milk each day while nursing. The body is set up to draw on what is in its own bones during this time. So bone mineral density falls over the months of nursing. After weaning, much of it is refilled again over the following months.
The same shape of story sits here. Loss comes first, refilling follows, and refilling takes time. And with enough time, much of it is refilled again.
During these months, though, conditions that make refilling harder arrive alongside it. Some mothers have their sleep broken through the night or their meals pushed off schedule. The time when the most needs to be refilled overlaps with the time when there is the least room to do it.
The period can also pause for a while during nursing. That does not mean the outgoing side disappears. Only where it goes out changes.
If the outgoing side is too large, this accounting no longer balances. That means a period lasting more than seven days, one heavy enough to disrupt daily life, or the passing of clots you have not had before. In that case, it is better to have the outgoing side checked at a gynecologist's office before addressing the refilling side.
The day bleeding ends shows up on the calendar. The day refilling finishes does not.
So what remains in the body is not those few days but the months that follow them. This is also why the days of a monthly period and the months after childbirth can be placed on the same line. It connects with the idea that postpartum strain, if endured and set aside, lingers for a long time.
Written by Dr. Heo Ji-young (PhD in Korean Medicine Pathology, Kyung Hee University · former Research Professor of Herbology, Kyung Hee University)
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