Ewa Janczewska graduated from the Faculty of Medicine of the Medical University of Silesia in 1990. She completed her postgraduate medical internship and worked at the Ministry of Internal Affairs Hospital in Katowice. In 1994, she obtained the first-degree specialization in internal medicine. She was appointed an assistant at the Department of Infectious Diseases of the Specialist Hospital in Chorzów. In 1999, she obtained the second-degree specialization in infectious diseases.
She was appointed Deputy Head of the Department in the year 2000. In 2003, Ewa Janczewska became the Head of Hepatology Outpatient Clinic of the Specialist Hospital in Chorzów. She holds a PhD degree in medical sciences (2004). Ewa Janczewska has been working at the ID Clinic in Mysłowice since 2012.