UPDATE:Pinkhas provided more details on the decision to postpone four tour dates.
According to social media messages she posted today, she says shes suffering from a respiratory infection.
As a result, she postponed shows in Tacoma, and now has added Vancouver to the delayed list.

PinkScott Legato / WireImage / Getty Images
The singer said a doctor advised her to take a step back from performing.
Live Nation are working on future dates to reschedule.
The statement continued, Family medical issues require our immediate attention.

I send everyone my sincerest apologies for any inconvenience this has caused.
I am sending nothing but love and health to all.
Pink didnt elaborate on the medical issues she is facing.