Check on your medication
Your liver can be harmed by improper or excessive medication use. Some other possibly harmful "medical" drugs you could take that can harm your liver include herbal medicines or supplements; herbal teas (if mixed with over-the-counter or prescription drugs such as heart medication); non-FDA-approved supplements from other countries; acetaminophen or ibuprofen (if taken in excess, will damage your liver), etc.
They are responsible for roughly 25% of all liver damage. "Pyrrolizidine alkaloids" found in plants including borage, comfrey, groom well, and coltsfoot have the potential to clog the organ's tiny blood vessels over time or all at once (if you take a lot). Atractylis gummifera, celandine, chaparral, germander, and pennyroyal oil (used in tea) are some herbs that might harm the liver.