May one have surgery during the three weeks?[1]

If the matter is not urgent and one is medically able to defer the surgery to a later date, then one is to avoid surgery during the three weeks. One may schedule the surgery from the 10^th of Av and onwards[2], although preferably, it is to be done after midday of the 10^th.[3] If one is unable to delay it until after the three weeks, then it should be done prior to Shabbos Chazon.[4]

[1] Igros Kodesh 19:376; 24:357; Shaareiy Halacha Uminhag 2:225

[2] Rebbe ibid in Igros Kodesh 19:376; See glosses of Chasam Sofer on M”A 551:2 that after Tisha B’av the Mazal of a Jew shines again

[3] See Shulchan Menachem 3:50

[4] Igros Kodesh 19:376