Morrissey has been hospitalised with pneumonia in both lungs.
The former Smiths frontman - who has suffered a string of health problems in recent months, including a bleeding ulcer, throat condition Barrett's oesophagus, and anaemia - was forced to cancel a show in San Francisco on Saturday due to the potentially life-threatening condition.
However, Morrissey - who only returned to the stage last month after axing a string of US dates because of his health woes - is hopeful of being well enough to perform at the Vive Latino Festival in Mexico on Thursday even if he is Still Ill, even though fans will have to Stretch Out and Wait to see if he can fulfill the gig.
A statement on fan site True to You said: "Morrissey is presently being treated in San Francisco for 'double pneumonia', but remains on course to headline the Vive Latino festival in Mexico City on March 14.
"Morrissey's show at the Regency Ballroom in San Francisco will now take place on May 1."
Meanwhile, Morrissey also hit out at "extreme and silly" security at the Arlene Schnitzer Theater in Portland, where he performed on Friday.
He said: "Place an obese McDonalds fry-girl into a venue security uniform and she is suddenly Eva Braun."
It'll be the last time we'll Ask.