Yes, arthritis can be dangerous, especially if left untreated or poorly managed. Severe forms of arthritis, such as rheumatoid arthritis, can lead to joint deformities, disability, and systemic complications affecting organs like the heart and lungs. Additionally, chronic inflammation associated with arthritis increases the risk of cardiovascular disease and other comorbidities. Proper diagnosis, treatment, and management are crucial to mitigate the potential dangers posed by arthritis.