During the week in which Tishah B’Av occurs our mourning intensifies. Therefore, the hachamim instituted the same strict prohibitions that apply to a mourner for these specific days in the following areas: 

1. Cleaning and laundering 

2. Shaving and haircutting

3. Bathing 

4. Nail cutting

Each of these will be discussed.

“The week in which Tishah B’Av occurs” refers to the exact week when Tishah B’Av falls, beginning with Sunday of that week. If the fast occurs on Sunday, or on Shabbat and is postponed until Sunday, it is permitted to be lenient regarding the previous week of all these stringencies. (One who desires to be strict under these circumstances may do so, but is permitted on Thursday and Friday to be lenient regarding these prohibitions if they are necessary for Shabbat.)