These guidelines are not just advice from a specialized doctor, but the result of cooperation between an endocrinologist and a patient with hypothyroidism. My long-term clinical experience in the treatment of hypothyroidism shows how difficult it is to understand where exactly to start therapy, where to find reliable information, what to focus on in the process of choosing therapy. By studying alternative methods, based on the research and practice of foreign authors, I developed my own author's methodology for the diagnosis and treatment of hypothyroidism.