Did you know that cancer is one of the most expensive illnesses to treat in the United States? It is no wonder that cancer patients are more likely to experience financial toxicity. Financial toxicity describes the problems related to the cost of treatment. Specifically, how out-of-pocket costs can cause financial problems for patients. Out-of-pocket costs can include copayments, deductibles, and coinsurance. These out-of-pocket costs can be from staying in the hospital, having procedures and tests done, doctor appointments, and/or prescription medications.