If you were very attentive in biology class, you know that there are no nerves in the liver, therefore it can’t feel any pain. So what was it all about that father needed more and more painkillers each and every day?
This is because a tumor is a growth. And a growth needs space. And how to get space inside your body? Right: you push things away.
Father’s liver never felt any pain, but the pain of the growing liver creates pressure. It is the pressure of this growing liver pushing on the other organs that makes each day a bit more painful than the previous. And the process is irreversible, meaning: a bit each day becomes a lot in a week and terrible in a month š
That’s why father had to start taking painkillers and unlike having a headache: you cannot afford to stop taking the painkillers, as the cause of your pain continues to grow! Sounds logical, but father tend to "forget’ taking his pain medication in the beginning of the end of his metastatic liver cancer.