Mishneh Torah, Human Dispositions 4:18-19
משנה תורה, הלכות דעות ד׳:י״ח-י״ט
Mishneh Torah, Human Dispositions 4:18-19
Rambam discusses health practices and cautions about habits that harm the body. These halakhot are part of his broader advice on maintaining bodily well-being and avoiding dangerous medical conduct.
לֹא יַרְגִּיל אָדָם לְהַקִּיז דָּם תָּמִיד. וְלֹא יַקִּיז אֶלָּא אִם יִהְיֶה צָרִיךְ לוֹ בְּיוֹתֵר. וְלֹא יַקִּיז לֹא בִּימוֹת הַחַמָּה וְלֹא בִּימוֹת הַגְּשָׁמִים אֶלָּא מְעַט בִּימֵי נִיסָן וּמְעַט בִּימֵי תִּשְׁרֵי. וּמֵאַחַר חֲמִשִּׁים שָׁנָה לֹא יַקִּיז כְּלָל. וְלֹא יַקִּיז אָדָם דָּם וְיִכָּנֵס לַמֶּרְחָץ בּוֹ בַּיּוֹם. וְלֹא יַקִּיז וְיֵצֵא לַדֶּרֶךְ. וְלֹא בְּיוֹם שֶׁיָּבוֹא מִן הַדֶּרֶךְ. וְיֹאכַל וְיִשְׁתֶּה בְּיוֹם הַהַקָּזָה פָּחוֹת מִמַּה שֶּׁהוּא רָגִיל. וְיָנוּחַ בְּיוֹם הַהַקָּזָה וְלֹא יִיגַע וְלֹא יִתְעַמֵּל וְלֹא יְטַיֵּל:
One should not accustom himself to constant bloodletting. He should not be bled unless there is an extreme necessity. He should not be bled in the summer or winter, but slightly in Nisan and slightly in Tishrei. After the age of fifty, he should not be bled at all. He should not be bled and go to the baths on the same day, or leave on a journey after being bled; nor should he be bled on the day on which he returns from a trip. He should eat less than usual on the day of a bloodletting. He should rest on that day, not exert himself, nor exercise, nor stroll.