The MdDS Foundation supports individuals affected by Mal de Débarquement Syndrome (MdDS) through advocacy, awareness, and resources aimed at improving diagnosis and treatment.

This organization supports individuals and families affected by Malan syndrome, a rare genetic disorder, through outreach, research, and community resources.

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The Canadian Spondyloarthritis Association provides resources and support for individuals living with spondyloarthritis, including virtual support groups and educational materials.

The MASNS Foundation is dedicated to improving the lives of families affected by Marbach-Schaaf Neurodevelopmental Syndrome (MASNS) through community support, public awareness, and research advancement.

Marinesco-Sjogren Syndrome is a rare genetic disorder organization that provides information and support to families affected by MSS, facilitating communication between families, doctors, and researchers.

Istituto Mario Negri conducts biomedical research to improve health, focusing on understanding disease mechanisms and providing information and training to healthcare professionals and the public.

The Marshall-Smith Syndrome Organization of the USA provides support, research, and advocacy for families affected by Marshall-Smith Syndrome.

Mass General Brigham is an integrated health care system that offers a full range of care through its hospitals and community healthcare centers, focusing on research and clinical trials to develop new treatments and therapies.

MastoKids is dedicated to providing help and support for families affected by mastocytosis, offering resources like a community membership and scholarships for students impacted by pediatric mast cell disease.

The Maternal Alloimmunization Foundation supports families affected by maternal alloimmunization and Hemolytic Disease of the Fetus and Newborn (HDFN) by raising awareness, educating patients and providers, and advocating for better care.

This organization supports individuals and families affected by Sheehan's Syndrome and postpartum Lymphocytic Hypophysitis by providing information, community support, and raising awareness about these maternal pituitary conditions.

Matheny Medical and Educational Center provides exceptional care and an optimal quality of life for children and adults with special needs and medically complex developmental disabilities through various programs including a hospital, school, and adult day program.

Matrix Parents is part of Marin CIL, serving families of children and young adults with disabilities in Marin, Napa, Solano, and Sonoma Counties, providing resources and support for various age groups.

Matthew's Friends is a UK registered charity that specializes in medical Ketogenic Dietary Therapies, supporting patients with drug-resistant epilepsy and other neurological and metabolic disorders through information, training, research, and grants.

The MdDS Foundation supports individuals affected by Mal de Débarquement Syndrome (MdDS) through advocacy, awareness, and a patient registry to gather information and improve research efforts.

MedicAlert Foundation provides 24/7 emergency response services and medical ID solutions to help individuals with medical conditions receive timely and accurate care during emergencies.

The Medicare Rights Center is a nonprofit organization that advocates for affordable health care access for older adults and people with disabilities through counseling, educational programs, and public policy initiatives.

Melanin Children Matter advocates for medically underrepresented children, providing support and education for families facing rare diseases and emphasizing health equity and social justice.