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Why is Tisha b'Av apparently stricter than other mitzvos--including Shabbos--with regards to rabbinical prohibitions for a choleh? On Shabbos, one who is in a state of choleh kol gufo (debilitating illness) or even tza'ar godol (severe pain) may do rabbinically-restricted melochos with a shinui for his comfort (source: Ribiat, The 39 Melochos, pp. 491-493). Also,

"A pregnant woman is permitted to take any medications, vitamins, or therapies to avoid any risk to her health or that of her baby. One may violate any melocho to save the life of a fetus, (even in the earliest stages of pregnancy)"

Ribiat 499.

According to this document (and this), it is universally accepted that a choleh she'ain bo sakanah, including most pregnant women, must a priori fast on Tisha b'Av. In short:

Even if one is ill, he must still observe the fast of Tisha B'Av to whatever extent possible.He may not eat more than what is necessary. [This is the basis of R. Schick's opinion.] Furthermore, he must still observe the other inuyim. As such, he is still considered someone who is fasting.

So basically I am asking, if even rabbinical matters surrounding Shabbos can be transgressed (with a shinui) for a choleh, then why can't the rabbinical enactment of fasting on tisha b'Av--to say nothing of the other rabbinical enactments for that day--be readily transgressed for a choleh? I understand one difference is the shinui, but is that all? If not, why did the rabbis allow more leniency for Shabbos (and, it would seem, most other mitzvos) than for Tisha b'Av?

  • Another way in which Tisha b'Av is stricter than a regular rabbinical enactment is that it starts at shkia and ends at tzeis: judaism.stackexchange.com/questions/44204/… – SAH Aug 2 '17 at 2:25
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    he.wikisource.org/wiki/… – Double AA Aug 2 '17 at 12:08
  • I'm not sure I get the question. These are two completely separate days with different reasons for the prohibitions. Why would one being 'lenient' affect how we treat the other? – Salmononius2 Aug 2 '17 at 13:56
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    Also, your second quote doesn't necessarily show that Tisha B'Av is 'more strict'. It's saying that you could only do what's necessary for the Choleh, but not more. How is that different than Shabbos, where you can also only violate Rabbinic prohibitions for what's necessary, but not more? – Salmononius2 Aug 2 '17 at 13:57

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