If you had ever stayed in a hospital you would know the answer to be no. Nurses regularly ask patients what their pain level is to determine which, if any painkillers they can have. Typically this is on a scale of one to ten and I quote "one being no pain at all and ten being the worst pain imaginable." I consistently found the majority of patients saying eight, nine of even ten- when they were simply laying in their bed reading a magazine. Then when the blood lady came along to take bloods and puts a tiny needle in their arm, they cry out and scrunch up their face. Whether this is an orchestrated ploy to get more morphine or they actually think the pain they are experiencing is next to the worst imaginable I don't know, but certainly pain varies from person to person and there is no way to reliably extract that information (as of yet).