sciencealert.com -- Mindfulness is a type of Buddhist-based meditation in which you focus on being aware of what you're sensing, thinking, and feeling in the present moment.
A 2022 study, using a sample of 953 people in the US who meditated regularly, showed that over 10 percent of participants experienced adverse effects which had a significant negative impact on their everyday life and lasted for at least one month.
According to a review of over 40 years of research that was published in 2020, the most common adverse effects are anxiety and depression. These are followed by psychotic or delusional symptoms, dissociation or depersonalisation, and fear or terror.
Research also found that adverse effects can happen to people without previous mental health problems, to those who have only had a moderate exposure to meditation and they can lead to long-lasting symptoms.