Biofeedback is an alternative medicine with the intent to give the patient greater awareness of their physiological functions, which will supposedly help the patient control these processes. With this premise, it is
unsuprising that some claims are utter bullshit.
There is some evidence that shows that biofeedback could potentially help with stress.
While getting the usual criticism alternative medicine tends to garner, biofeedback has also been criticized for being expensive.
Some take biofeedback one step futher and claims unsubstantional and emberassing crap that would make anyone with any dignity ashamed, and that's why many of these claims are made by quacks, cranks and new agers. These include claims of more desireble brainwaves, being able to reach spiritual or higher conciousness and just stuff that is impossible for the human body to do.