Psoriasis (Ps), psoriatic arthritis (PsA), and inflammatory bowel diseases (IBDs) are characterized by a progressive course and commonly result in disability. Therefore, their early diagnosis with the assessment of a clinical phenotype and unfavorable prognostic factors and the timely initiation of therapy are important. The paper provides the expert consensus on the definition of the early stage of Ps, PsA, and IBDs, their treatment goals and main unfavorable prognostic factors. It also gives the rationale for the early use of biological agents in patients with immune-mediated inflammatory diseases.