“For some, meditation has become more curse than cure.”

https://noimnotok.wordpress.com/2015/10/30/why-cant-i-meditate/

Link provided by alexmoriah86 in the comment section:

http://www.theatlantic.com/health/archive/2014/06/the-dark-knight-of-the-souls/372766/

After 100 years of research into psychotherapy, it’s obvious that scientists and clinicians have learned a lot about the benefits of therapy, but what do we know about the harms? According to Britton, a parallel process is happening in the field of meditation research…

Given the juggernaut—economic and otherwise—behind the mindfulness movement, there is a lot at stake in exploring a shadow side of meditation. Upton Sinclair once observed how difficult it is to get a man to understand something when his salary depends on his not understanding it…

Shinzen Young, a Buddhist meditation teacher popular with young scientists, has summarized his familiarity with dark night experiences…

Almost everyone who gets anywhere with meditation will pass through periods of negative emotion, confusion, [and] disorientation. …The same can happen in psychotherapy and other growth modalities. I would not refer to these types of experiences as ‘dark night.’ I would reserve the term for a somewhat rarer phenomenon. Within the Buddhist tradition, [this] is sometimes referred to as ‘falling into the Pit of the Void.’ It entails an authentic and irreversible insight into Emptiness and No Self. Instead of being empowering and fulfilling … it turns into the opposite. In a sense, it’s Enlightenment’s Evil Twin…

The identities of Britton’s subjects are kept secret and coded anonymously. To find interviewees, however, her team contacted well-known and highly esteemed teachers, such as Jack Kornfield at California’s Spirit Rock and Joseph Goldstein at the Insight Meditation Center in Massachusetts. Like many other experienced teachers they spoke to, Goldstein and Kornfield recalled instances during past meditation retreats where students became psychologically incapacitated. Some were hospitalized. Says Britton, “there was one person Jack told me about [who] never recovered.” …