A stable periodontitis patient who was previously well-controlled suddenly develops 80% bleeding sites and increased probing depths. What underlying systemic condition should be MOST strongly suspected?

Correct answer: A. Newly developed or poorly controlled diabetes mellitus

• A. Correct. An abrupt worsening of a previously stable periodontitis patient — especially widespread bleeding and increased probing depths — should raise strong suspicion for DIABETES MELLITUS (new onset or worsening control). Hyperglycemia impairs neutrophil function, increases inflammatory cytokines, and impairs wound healing, causing rapid periodontal deterioration. HbA1c should be checked.
• B. Emphysema is a pulmonary disease with no direct mechanism causing acute periodontitis worsening.
• C. Wilson's disease (copper metabolism disorder) is not a primary cause of sudden periodontitis worsening.
• D. Leukemia can cause gingival infiltration and spontaneous bleeding, but is a less common explanation for a previously stable periodontitis patient showing widespread probe depth increases.