When a person has nausea that has no clear medical reason and appears to be influenced by the individual's emotional condition, this is known as psychosomatic nausea. Psychosomatic symptoms and disorders can have a negative connotation at times. You may be told that what you're going through is "all in your brain." However, while there is a mind-body connection when it comes to psychosomatic symptoms, the physical symptoms are very real and can be quite severe at times. Medium to high levels of stress, anxiety, or sadness is the most common causes of psychosomatic sickness, illnesses, and symptoms. It's a mind-body phenomenon, to put it simply, but it's also a little more complicated.