1st Trimester of Pregnancy - gentle gongs are generally considered safe. Please discuss in advance.
Tinnitus/Meniere’s/Epilepsy – any condition which is ‘sound sensitive’ or could be triggered by sound. (some with tinnitus report it helps). Hearing aids may need to be turned off.
Metal Implants/pins/screws/pacemaker etc. (can resonate the metal and possibly change rhythm of pacemaker).
Mental health conditions - serious mental health conditions and those who are unstable.