Value Village ／ Health
This answer is a draft. It stays unpublished until legal review and source verification are complete.
Period pain (dysmenorrhoea) is generally described as affecting about 70% of women in Japan, with 20–30% affected badly enough to disrupt daily life. The idea that it is "something to put up with" is still strong here, so simple steps such as warmth and painkillers are often delayed. Here are the measures with evidence behind them, and the signs that mean a visit to a gynaecologist (婦人科, fujinka).
| Measure | Details | Strength of evidence |
|---|---|---|
| Warmth | Heat pads (kairo, 使い捨てカイロ), a hot-water bottle or a belly warmer (haramaki) on the lower abdomen and lower back; a bath at 38–40°C (100–104°F). Overseas research has reported heat patches as effective as painkillers | Medium to high |
| Painkillers (NSAIDs) | Ibuprofen, loxoprofen, naproxen, etc. Take as soon as the pain starts, or if it comes at the same time every month, anticipate it and take one just before. They suppress prostaglandin production, so they work less well once it has been produced | High |
| Acetaminophen (paracetamol) | Gentle on the stomach, but for period pain NSAIDs usually work better | Medium |
| Exercise and stretching | Light aerobic exercise and yoga have been reported to ease the pain | Medium |
| Diet | Cut back on caffeine, alcohol and cold drinks; iron, magnesium and omega-3 are supplementary | Low to medium |
| Sleep and stress | Lack of sleep and stress make the pain feel worse | Medium |
| Kampo (traditional herbal medicine) | Tōki-shakuyaku-san, Kami-shōyō-san and others are sometimes prescribed under health insurance | Medium |
| Low-dose pill (LEP) and progestin preparations | Covered by health insurance. Suppress ovulation and thin the lining, greatly reducing pain and bleeding. Slow the progression of endometriosis | High |
| Mirena (intrauterine progestin-releasing system) | Covered by health insurance, effective for 5 years | High |
| Sign | What it may indicate |
|---|---|
| Bedridden despite painkillers; missing school or work | Dysmenorrhoea that qualifies for medical care |
| Pain getting worse year by year | Endometriosis (increasing in the 20s–30s; left alone it can lead to infertility and swollen ovaries) |
| Lower abdominal pain outside your period; pain on passing stools or during sex | Endometriosis |
| Heavy bleeding (an overnight pad fills within 1–2 hours, many liver-like clots), anaemia | Uterine fibroids, adenomyosis |
| Irregular cycle; no period for 3 months or more | Hormonal problems |
| A sudden change in pain or bleeding after age 40 | Fibroids, adenomyosis, others |
[Verify] Check the share of women who experience period pain and the share with disrupted daily life, and the research on heat patches, against the Japan Society of Obstetrics and Gynecology and related studies. Check the current scope of health-insurance coverage for the low-dose pill and similar.
Pain that keeps you in bed qualifies as dysmenorrhoea and can be managed under health insurance. Putting up with it is not a virtue, and can delay the discovery of endometriosis.
It works better taken before the pain-producing substance is made. As soon as the pain starts, or anticipate it and take one just before.
At the right dose, tolerance hardly develops. But if you need them on 10 or more days a month, see a gynaecologist about the underlying cause.
Research has shown that heat eases the pain. Heat pads, belly warmers and baths are measures with evidence.
The low-dose pill (LEP preparations) is covered by health insurance for dysmenorrhoea and endometriosis. It can be prescribed to teenagers too.
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https://www.jsog.or.jp/modules/diagnosis/
https://www.jsog.or.jp/citizen/
https://www.bosei-navi.mhlw.go.jp/
⚠️ Editorial note: the source URLs above were identified by search. Our working environment cannot reach go.jp domains, so the contents have not been checked against the text. Verify every source before publication and record who checked it and when.
What we share here are ideas and everyday practices passed down among people living in Japan, together with general information drawn from public sources. They are not official recommendations, and they are not professional instruction. Practices vary between households and regions.
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