A person trained to advise and advocate for people who have been sectioned under the Mental Health Act (MHA) in England and Wales. IMHAs can advise patients of their rights and the rights of their family, explain relevant sections and conditions of the MHA, and the reasons and legal basis for treatments a patient receives. IMHAs can additionally make complaints, apply to the Mental Health Tribunal (MHT), access legal support, and speak on behalf of a patient at review meetings or hearings.