A case report of interstitial pneumonia induced by vedolizumab in a patient with ulcerative colitis.

Rationale: The interstitial pneumonia (IP) linked to vedolizumab (VDZ) in patients with ulcerative colitis (UC) is rare. Prompt diagnosis and treatment can improve patient outcomes.

Patient Concerns: A 39-year-old man with UC who received VDZ as sole therapy developed symptoms such as chest tightness, cough, and suffocation.