Mental Imagery involves using symbols to imagine that the changes you desire in your body are actually happening. For example, you might imagine that pain is melting away and dripping like a warm liquid out of your fingertips. Or you might develop an image of your immune cells actively subduing and preying on cancer cells or viruses, like birds of prey swooping down to engulf field mice in a meadow. This is a highly personalized technique and you would use images that are uniquely exciting and meaningful to you.

Studies of mental imagery have found that people can actually influence their immune functioning as well as significantly reduce pain and tension in the body with this method. But aside from the physiological benefits, which take some practice to achieve, there is also the knowledge that you are doing something to help yourself, channeling your energy into a healing activity. This in itself helps to improve emotional well-being and build a sense of self-efficacy or confidence, which research has found to improve immune functioning.
In one study, metastatic cancer patients using daily imagery for a year achieved significant improvements in natural killer cell activity and several other measures of immune functioning.

At Michigan State University, researchers found that students could use guided imagery to improve the functioning of certain white cells called neutrophils, important immune cells in defense against bacterial and fungal infection. They could also decrease, but not increase, white cell counts. At one point in the study, a form of imagery intended to increase neutrophil count unexpectedly caused a drop instead. Subsequently, students were taught imagery explicitly intended to keep the neutrophil count steady, while increasing their effectiveness. Both of these goals were achieved