Hi, Tylenol contains acetaminophen or paracetamol which belongs to the group of medications known as analgesics is used in the treatment of mild to moderate pain such as headache, back pain, toothaches, cold aches, sore throat, muscle spasms, earache, fever and many more. Acetaminophen like Tylenol may cause liver damage. A person who suffers from pale colored stools after taking painkillers like may have drug induced liver damage. Because, pale colored stools are not normal. Pale colored stools may result from liver and biliary problems. For that reason, you should stop taking this medication and inform your doctor first for medical attention and further evaluation. You should not start taking this medication again without consulting your doctor. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Zubayer Alam, General And Family Physician