Recently there was an article in quartz media about a study published in a less well known normal about side effects of meditation including anxiety, lack of motivation, flash backs, no longer in touch with emotions, sleep changes, hallucinations etc
The answer is even in meditation there have emerged many patterns and methods. Also different environmental sounds and techniques are used also. It is very likely that some of the techniques are harmful and dangerous
Moreover there are very few real guru out there thus following a guru with no real knowledge of meditation can harm the student.
THIS IS NOT A COOK BOOK THAT YOU CAN GRASP BY READING AND IMPLEMENTING OR GO TO A GURU AND FOLLOW BLINDLY
Such techniques and guru cause more damage than good. They end up giving wrong publicity and disseminate wrong information
It is simple to find a real guru. A sincere interest in finding god and a real interest in peace – not an iota of interest in name game fame or gain ( financial or sexual) then a guru appears
All science and research on meditation is as such only done on those who have not learned to meditate
Those who know how to meditate run away from science. They find little need for science in meditative skills
Bhavin