Cancer
According to the Journal of Clinical Oncology, cancer is one of the most common things doctors get wrong—so much so that misdiagnoses occur 28 percent of the time, most frequently being lymphoma, sarcomas, melanoma, and breast cancer. Because there are so many different signs and symptoms, missing information, and incomplete family history, it’s not uncommon to think something else is wrong first or for it to go unnoticed until it’s harder to treat.