A non-neoplastic or neoplastic disorder that affects the thymus. Representative examples include thymic hyperplasia, thymoma, and thymic carcinoma. The disease is thymus gland disorder (MONDO_0003393, a Monarch Disease Ontology id). Also known as: Thymus disorder, disease of thymus, disease of thymus gland, disease or disorder of thymus, disorder of thymus, disorder of thymus gland, thymus disease, thymus disease or disorder.