Patients who are suffering from symptoms that their doctor has difficulty diagnosing may wonder if they've come down with a rare condition. Although instances in which a doctor is unable to diagnose a patient's symptoms don't happen all that often, there are two common reasons to explain why these types of events occur.
Your doctor may be hesitant to make a misdiagnosis. They may also not have listened to all of the symptoms as you described them when they saw you, resulting in a missed diagnosis.