Read this first
When to worry
Heavy is easier to define than it feels. Soaking through a pad or tampon every hour for several hours, passing clots larger than a coin, bleeding longer than seven days, or needing double protection are all working definitions. The volume matters less than what it is costing you.
Get help now — same day or emergency
- Bleeding through protection every hour for more than two hours, or passing large clots, with dizziness, breathlessness or fainting.
- Any bleeding twelve months or more after your last period.
- Bleeding with fever, severe pelvic pain and abnormal discharge.
- A positive pregnancy test with bleeding and pain.
- A racing heart with breathlessness at rest — severe anaemia.
Get it looked at within days
- Periods lasting more than seven days, or a cycle shorter than 21 days, repeatedly.
- Fatigue, breathlessness on stairs, restless legs, hair loss, or a craving for ice — ask for a blood count and ferritin.
- Bleeding between periods, or after sex.
- A period that has become much heavier in the last few cycles, particularly in the forties.
- Heavy bleeding with a known fibroid, or with a bleeding disorder in the family.
Heavy periods are the commonest cause of iron deficiency in menstruating women, and iron deficiency without anaemia still causes fatigue, breathlessness and poor concentration. A normal haemoglobin does not rule it out — ferritin is the test that does, and it is worth asking for by name.
One rule for this whole list: if you are not sure whether a line applies to you, treat it as though it does — and get it checked. Uncertainty is a reason to be seen, not a reason to wait.
Four presentations behind heavy bleeding
Volume alone is a poor guide. Whether the cycle is regular, whether there is pain, and whether bleeding happens outside the period point to different causes and different next steps.
Heavy but regular
Cycles on time, but bleeding heavy and sometimes prolonged, often with clots and a dragging sensation in the pelvis.
Points to Fibroids, adenomyosis, a copper coil, and inherited bleeding disorders such as von Willebrand disease. Structural causes are common and treatable.
Heavy and irregular
Unpredictable timing and unpredictable volume, often with long stretches without bleeding followed by a flood.
Points to Anovulatory cycles, perimenopause, thyroid, PCOS. Harder to read and more important to investigate, because the treatable causes here are medical rather than structural.
Bleeding outside the period
Spotting between periods, bleeding after sex, or a second bleed inside one month.
Points to Cervical or endometrial pathology, infection, hormonal fluctuation. Investigated, not read — this is the presentation where a pattern approach is least appropriate.
Heavy with pain
Heavy flow together with cramping or deep pelvic pain, often worsening over years.
Points to Endometriosis and adenomyosis present with both. The pain pattern and the volume together are more informative than either alone.
What the patterns describe
The classical category is 崩漏 — bleeding that either floods (崩) or drips without stopping (漏), and the tradition treats the two as one problem with two faces. The reasoning is about what holds blood in place: 脾 is said to govern or hold it, 肝 to store it, and 冲任 to be the vessel it moves through. When the holding fails, the bleeding comes.
The 素问 line that anchors the heat version is blunt: when yin is deficient and yang beats against it, this is called 崩. It is one sentence and it has been the frame for a very large literature. What it does not do — and cannot — is find a fibroid. That is the honest limit of the classical account here, and it explains why every traditional source on 崩漏 assumes the bleeding has already been looked at by someone with hands.
The practical consequence for a reader is a division of labour. The tradition is useful for the part that follows the diagnosis: what to eat, how much to rest, whether the picture is one of heat or of collapse. It is not useful, and does not claim to be useful, for deciding whether the bleeding has a structural cause.
Which patterns it belongs to
These are the patterns this symptom is conventionally grouped under. They are not competing diagnoses — most people meet one, and the point of the list is to show you which questions separate them.
Heavy periods of pale thin blood, fatigue on exertion, loose stools, a pale tongue with teeth marks, a soggy pulse.
The classic reading — the spleen failing to hold blood, so it comes early, heavy and pale, with fatigue.
Read the pattern page →Heavy bleeding with a dragging pelvic sensation, breathlessness on stairs, spontaneous sweating, a low voice, an empty pulse.
The collapse version: heavy bleeding with a bearing-down feeling, breathlessness and a low voice.
Read the pattern page →Early heavy periods of bright red blood, night sweats, heat in the palms and soles, sore lower back, a red tongue with little coat, a thin rapid pulse.
The heat version: early, heavy and bright red, with night sweats and a dry mouth.
Read the pattern page →Heavy dark sticky periods with an offensive smell, yellow discharge, a bitter taste, dark scanty urine, a yellow greasy tongue coat, a slippery rapid pulse.
Heavy, dark, sticky bleeding with a strong smell, often with discharge and a bitter taste.
Read the pattern page →Heavy periods followed by exhaustion, palpitations, dizziness on standing, pale lips and nails, a pale tongue, a thin pulse.
Not a cause of the bleeding but its commonest consequence — and the reason iron is the first question.
Read the pattern page →The signs behind it
Each line below is one entry in the sign table — the same table the self-check draws its follow-up questions from. The tier says how strongly that sign points at the pattern: a defining sign is expected, a common one is usual, a supporting one is optional.
- Heavy or prolonged periods Qi deficiencysupporting ·Blood deficiencysupporting ·Damp-heatsupporting
- Pale lips and nail beds Blood deficiencydefining ·Qi deficiencycommon
- Dizziness or blurred vision on standing Blood deficiencydefining ·Qi deficiencycommon ·Kidney yang deficiencycommon ·Kidney yin deficiencysupporting ·Spleen yang deficiencysupporting ·Liver yang risingsupporting
- Palpitations Blood deficiencydefining ·Kidney yin deficiencycommon ·Qi deficiencysupporting ·Kidney yang deficiencysupporting ·Liver yin deficiencysupporting ·Liver yang risingsupporting
- Fatigue with minimal exertion Qi deficiencydefining ·Spleen qi deficiencycommon ·Blood deficiencycommon ·Kidney yang deficiencycommon ·Damp-heatsupporting ·Spleen yang deficiencysupporting
- Dragging or bearing-down feeling Spleen qi deficiencysupporting ·Qi deficiencysupporting
Not every sign listed here will apply to you — a sign only counts alongside the others. The self-check is the place to weigh them against your own answers.
Telling them apart
Four questions do most of the work. Each one splits the field in half, and after two or three the pattern is usually clear enough to act on — or clear enough to know that the answer is medical rather than traditional.
| Question | If yes | If no |
|---|---|---|
| Is the bleeding heavy every cycle, or only some? | Every cycle, predictable → structural causes (fibroid, adenomyosis, coil) and a bleeding disorder move up the list. | Intermittent, with normal cycles in between → hormonal fluctuation or perimenopause, and the pattern reading is more useful. |
| Is there pain with it? | Yes, cramping or deep pain that worsens over years → endometriosis or adenomyosis. Worth naming explicitly at an appointment, because it is often recorded as "heavy periods" alone. | No pain, just volume → fibroids and bleeding disorders are the more likely structural answers. |
| Are you breathless on stairs, or craving ice? | Yes → iron. Ask for ferritin as well as a blood count, and treat it while the cause is being worked out. | No fatigue and no cravings → still worth a blood count once, because heavy periods without symptoms are common and anaemia can develop slowly. |
| Have you gone twelve months without a period? | Yes, and there is any bleeding → urgent assessment. Postmenopausal bleeding needs excluding for endometrial cancer, and no pattern reading substitutes for that. | Still cycling → the ordinary workup applies, and it starts with a blood count and an examination. |
What you can do at home
None of this treats a named condition, and none of it replaces assessment. These are the ordinary measures attached to this symptom — low risk, and worth doing while you work out what is actually going on.
- Count rather than estimate. How many pads or tampons on the heaviest day, how many days, how large the clots. Two lines per cycle turns a vague complaint into a number a clinician can act on.
- Ask about iron rather than starting a supplement blindly. Ferritin first, then treat — and take iron with vitamin C, away from tea and coffee, which is the difference between absorbing it and not.
- There are prescription measures that reduce flow substantially — tranexamic acid, and hormonal methods including a coil. They are worth asking about rather than enduring; heavy periods are not something to be got through quietly.
- Rest more in the first two days, and eat warm cooked food. This is the traditional advice and it is also the practical one: the days of heaviest loss are the days when you have least to spare.
- Do not read the pattern first. In this symptom more than any other on the site, the pattern is the second question — the first is whether the bleeding has a cause that a pattern cannot see.
Classical sources
Quoted in the original, with our own translation and the chapter it comes from. We do not reproduce existing English translations — they are someone else's reading.
阴虚阳搏谓之崩。 yīn xū yáng bó wèi zhī bēng
When yin is deficient and yang beats against it, this is called flooding.
血气不和，百病乃变化而生。 xuè qì bù hé, bǎi bìng nǎi biàn huà ér shēng
When blood and qi are not harmonious, the hundred illnesses change and arise from it.
今妇人之生，有余于气，不足于血，以其数脱血也。 jīn fù rén zhī shēng, yǒu yú yú qì, bù zú yú xuè, yǐ qí shuò tuō xuè yě
In the life of a woman, qi is in excess and blood is insufficient, because she repeatedly loses blood.
The 阴阳别论 sentence is one line out of a chapter about pulse prognosis, and it has carried an enormous amount of later theory. It is quoted here because it is the earliest statement of the heat mechanism for flooding, not because it describes heavy periods as now defined — the classical category 崩漏 is broader and includes what would today be called irregular bleeding of unknown cause. Where the tradition and the modern workup disagree, the modern workup goes first on this page, and that ordering is deliberate.
Terms used on this page
One concept, several names. The standard term comes first; pinyin and characters are there so you can search and cross-check; older aliases are what you will meet in other people's writing.
| Standard term | Pinyin | 中文 | Also written as |
|---|---|---|---|
| Flooding and dripping | bēng lòu | 崩漏 | The classical category — sudden heavy loss (崩) and continuous slight loss (漏), treated as one problem |
| The spleen holds the blood | pí tǒng xuè | 脾统血 | The function whose failure is the standard explanation for heavy bleeding |
| Blood heat | xuè rè | 血热 | Heat in the blood forcing it out of the vessels — the reading behind early, bright, heavy bleeding |
| Penetrating and directing vessels | chōng rèn | 冲任 | The vessels whose damage the classical texts give as the mechanism of abnormal bleeding |
Check your own pattern
Heavy periods is a symptom, and symptoms appear in several patterns. The self-check weighs twelve questions against all twelve patterns and shows you what fits — and what doesn't quite.
Start the self-checkAbout four minutes. No account, nothing stored on a server, and an address for the printable report is optional.