Do you need to be in good health to naturalize?

Some countries require you to submit your medical history and/or be in good health for naturalization. While Japan does require people that are applying for 氞䜏暩 {eijūken} (permanent residency) to be in good health, there is no such requirement for naturalization. Also, unlike many other countries, Japanese permanent residency status is not a prerequisite for obtaining Japanese citizenship.

In case you were wondering, the good health requirement for Japanese 氞䜏暩 {eijūken} (permanent residency) is defined with the following guideline:
公衆衛生䞊 {kōshÅ« eisei jō}有害ずなる {yÅ«gai to naru}おそれのある疟病 {osore no aru shippei}（梅毒その他 {baidoku sonota}䌝染性疟患 {densensei shikkan}及び {oyobi}麻薬、芚醒剀等の䞭 {mayaku, kakuseizai nado no naka}毒性疟患 {dokusei shikkan}）に眹患しおいないこず。 {ni rikan shite inai koto.}健康蚺断曞等を {kenkō shindan sho nado o}提出したす。 {teishutsu shimasu.}
Which roughly translated / paraphrased, is:
Those who are not suffering from diseases that are harmful to the public health (including syphilis and other infectious diseases, as well as addictions to drugs such as stimulants or narcotics). You may have to present a health examination certificate.
There is no health requirement for 特別氞䜏暩 {tokubetsu eijÅ«ken} (Special Permanent Residency), which is not a status that is available to most immigrants anyway.

Prior to naturalizing, I had permanent residency status in Japan, but I was not required to submit any documentation related to my health when I applied, so I guess the requirement is at the discretion of the case worker handling the applicant.

It is conceivable that if you have an obvious problem with your health that would prevent you from working in most areas of employment, they may ask additional questions about another requirement for naturalization, which is:
自己又は {jibun mata wa}生蚈を {seikei o}䞀にする {itsuni suru}配偶者 {haigÅ«sha}その他の芪族の資産 {sono ta no shinzoku no shisan}又は技胜によっお {mata wa ginō ni yotte}生蚈を営むこずができるこず {seikei o itonamu koto ga dekiru koto}
Or paraphrased:
be able to, with your skills and the combined financial resources of you and your spouse & family, support yourself
By the way, while it's true that Japanese health care is pretty good by most world standards according to international metrics and that Japanese have some of the highest longevity rates in the world, it is known that foreigners who immigrate as an adult and live in Japan for a long time do not seem to inherit this longevity trait.

It is unknown whether naturalized citizens live as long as non-naturalized Japanese, probably because there is not yet enough data.

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