[117] The next day, Saturday, the doctor was called again, and arrived  to find Harrison in bed with a "severe chill", after taking another early morning walk. Miller applied mustard plaster to his stomach and gave him a mild laxative, and he felt better that afternoon.[117] At 4:00 a.m. Sunday, March 28, Harrison developed severe pain in the side and the doctor initiated bloodletting; the procedure was terminated when there was a drop in his pulse rate. Miller also applied heated cups to the president's skin to enhance blood flow.[117] The doctor then gave him castor oil and medicines to induce vomiting, and diagnosed him with pneumonia in the right lung.[117] A team of doctors was called in Monday, March 29, and they confirmed right lower lobe pneumonia.[118] Harrison was then   administered laudanum, opium, and camphor, along with wine and brandy.[119]
No official announcements were made concerning Harrison's illness, which fueled public speculation and concern the longer he remained out of public view.[118] Washington society had noticed his uncharacteristic absence from church on Sunday.[111] Conflicting and unconfirmed newspaper reports were based on leaks by people with contacts in the White House.