Intake of saw palmetto has led to noted side effects. The most common saw palmetto side effects include stomach pain, vomiting, nausea, bad breath, diarrhea or constipation. The stomach problems can be alleviated by taking saw palmetto with food. Less common but worse side effects include stomach ulcer, liver damage and jaundice (yellowing of skin), but the actual role of saw palmetto in these cases remain unclear. There have also been invalidated reports of insomnia , depression, headache, muscle pain, chest pains, high blood pressure, heart problems and breathing difficulties.