Which statement best describes the relationship between DVT and cellulitis?

• A. They are the same condition
• B. DVT never leads to cellulitis
• C. Cellulitis never leads to DVT
• D. A DVT increases risk of secondary cellulitis, and cellulitis increases risk of DVT

Answer: (D)

DVT and cellulitis are distinct problems, but they can feed into each other. A deep vein thrombosis in the leg causes swelling and fluid buildup (edema), which stretches the skin, impairs tissue oxygenation, and can weaken the skin’s barrier and lymphatic drainage. That environment makes bacterial invasion more likely, so cellulitis can develop as a secondary complication.

Conversely, cellulitis triggers local and systemic inflammation, which increases procoagulant activity and can promote venous stasis from pain and immobility. The swelling from infection also worsens venous return, further raising the risk of a new or extended DVT. In short, the presence of one condition can raise the likelihood of the other, creating a bidirectional relationship.

That’s why the statement describing a bidirectional relationship—where a DVT increases the risk of secondary cellulitis and cellulitis increases the risk of DVT—best captures how these two conditions interact. The idea that they are the same condition, or that one never leads to the other, doesn’t fit the clinical pathophysiology, and a one‑way relationship doesn’t reflect the reality of how inflammation, edema, and immobility link them.