The IgG4-related disease treatment market is set to grow significantly by 2034, driven by increasing prevalence, awareness, and the launch of new therapies. Current treatments rely on off-label drugs like glucocorticoids and rituximab, with no approved therapies specifically for IgG4-RD. Key players like Zenas BioPharma and Horizon Therapeutics are advancing treatments, with promising pipeline drugs expected to revolutionize the market. The 7MM market size was around USD 150 million in 2023, with the US leading. The disease, affecting mainly middle-aged to elderly men, presents challenges in diagnosis and treatment, emphasizing the need for early intervention to prevent organ damage.