Primary liver cancer refers to malignant tumors that occur in the liver and are not metastasized from other parts of the body. Such liver cancer itself is not contagious. However, if liver cancer patients have other infectious diseases, transmission may be possible. Most primary liver cancers are related to liver cirrhosis following hepatitis, with hepatitis B being the most common. If accompanied by hepatitis B, it can be contagious, but it usually doesn't spread through regular daily contact. The main transmission routes for hepatitis B are through blood, mother-to-child transmission, and sexual transmission. This means that as long as the patient's blood does not injure someone else, contagion is generally unlikely, so there is no need for excessive worry.