Hemophilia (IMAGE) University of California - San Diego Caption People with hemophilia can experience spontaneous internal bleeding, primarily into the joints, which can last for days unless controlled by medication. Pictured: a sufferer with swelling from an internal bleed into the knee. Credit Photo courtesy of C. Campos-MacDonald Usage Restrictions Use photo credit as indicated License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.