For Staff: Please believe patients when they tell you their medical history. For a patient in pain, having to swear that a fact is true over and over again is really annoying and it delays treatment. Looks can be deceiving. A 'young' person can have a disease normally seen in older folks.
Tend to the privacy of your patients. If all the rooms are full and you have to do care in the hall, have other staff hold up a sheet or block the view.
On that note, if doing an intake in the hall, speak softly. Patients do not want their history publicized!
If a patient is conscious and the situation doesn't require immediate action, consult your patients as to their wishes about treatment.
Pain meds can be great, but sometimes a patient won't want them or, at least, not huge amounts. Respect that refusal.
If you are conducting a test and see something bad on the test, don't say "Oh deity" or something like that in front of the patient, then refuse to explain what is going on. Seriously folks, that just makes the patient twice as anxious.