Purpose of Review: Based on a comprehensive literature review, this paper evaluates the clinical effectiveness of house dust mite (HDM) avoidance measures. It aims to determine whether interventions actually lead to symptom relief or merely reduce allergen concentrations without significant clinical benefit. Recent Findings: The reviewed data reveals a significant "clinical gap": while encasings and environmental cleaning effectively lower allergen loads, their impact on symptoms—especially in adults—is often statistically insignificant. In contrast, pediatric patients benefit more from aggressive, multimodal environmental control. Summary: The review concludes that isolated measures are rarely sufficient as a monotherapy. Complete allergen eradication is practically impossible, making avoidance a supportive effort rather than a standalone cure. Consequently, avoidance measures should be seen as a synergistic part of a broader treatment plan and must not be a prerequisite for Allergen Immunotherapy (AIT). AIT remains medically necessary precisely because environmental control alone cannot eliminate the triggers in modern daily life.