can morphine cause anxiety
A fair number of people love the feeling of the opiates but it also induces an initial anxiety in them so they self medicate with benzos to counter this. Morphine does not produce this anxiety effect in all peoples but peoples whom are more prone to anxiety attacks will be more likely to experience anxiety from it. Morphine on the whole triggers the reward endorphin system and therefor in the majority of people will not produce an anxiety effect.