An illustration of the Vagus nerve, which is part of the autonomic nervous system. Sebastian Kaulitzki/Science Photo Library RF/Getty Images hide caption
autoimmune conditions autoimmune conditions
An illustration of the Vagus nerve, which is part of the autonomic nervous system. Sebastian Kaulitzki/Science Photo Library RF/Getty Images hide caption
There are 80 different autoimmune diseases, affecting up to 50 million Americans. Oona Tempest/KFF Health News hide caption