A misdiagnosis occurs when a doctor provides a patient with an incorrect diagnosis. The first instance of this occurs when a doctor states that a person has one condition when that patient really does not have it. The other case takes place when the doctor fails to diagnose a patient when that person is actually suffering from such a medical condition.
The misdiagnosis often causes a patient to end up receiving treatments that one does not actually require. For instance, a person may be diagnosed as having a form of cancer when that person does not actually have it. This can cause the patient to be subjected to chemotherapy that could do more harm to the body than help.