The probability of cancer in severe fatty liver is related to whether fatty liver causes steatohepatitis and steato cirrhosis. 1. If severe fatty liver does not cause steatohepatitis or cirrhosis, the probability of cancer is low, usually around 1%. 2. If severe fatty liver causes steatohepatitis, the probability of causing liver cancer will increase accordingly. 3. If fatty cirrhosis is caused by steatohepatitis, the probability of liver cancer will be significantly higher, generally ranging from 5% to 10%, with individual differences. If severe fatty liver is diagnosed, it is recommended to seek medical treatment as early as possible and carry out standardized treatment under the guidance of professional physicians to reduce the adverse effects of the disease and avoid delaying the condition.