Hepatitis during anti-tuberculous treatment (HATT) is a complex issue for patients with chronic viral hepatitis C, especially when it recurs after re-challenging the anti-tuberculous drugs. Concerns exist about the safety profile and efficacy of interferon-alpha therapy for active hepatitis C in patients with pulmonary tuberculosis. Herein, we report a 43-year-old man who developed an acute flare-up of hepatitis C during anti-tuberculous treatment and was successfully treated with interferon-alpha and ribavirin. The reduction of liver enzymes correlated well with the hepatitis C viral load, thus enabling the re-challenge with isoniazid and rifampin. This case demonstrates the benefit of interferon-alpha therapy in managing an acute flare-up of hepatitis C during anti-tuberculous treatment. (Thorac Med 2011; 26: 352-356)