The FDA recognizes chemotherapy, radiation, and surgery as treatments for cancer. Cancer studies are often funded by drug companies, which benefit from the sale of the drugs, creating a research bias that overlooks many dangerous side effects. Think of chemo – fatigue, hair loss, appetite loss, nausea, or vomiting comes to mind, but there are lesser-known side effects like fertility issues, infection, mouth, tongue, and throat problems, peripheral neuropathy, or nerve pain, and urine, bladder, and kidney problems.