RecruitingBehavioural interventionValidation and Scaling of Screening Program for Undiagnosed Myasthenia Gravis-Social Media Campaign Paired With a Self-moderated AssessmentThis study expands and validates the pilot study NCT06381284. It is a fully remote, site-less, prospective, observational study enrolling adults in the United States (excluding U.S. territories) with undiagnosed neuromuscular symptoms. The primary objective is to determine the validity of a self-assessment tool in encouraging undiagnosed participants, recruited through a social media campaign, to seek medical evaluation for suspected myasthenia gravis (MG).