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Unnecessary hysterectomies due to undiagnosed bleeding disorder in women: The bleeding disorder called Von Willebrand's disease is quite common in women, but often fails to be correctly diagnosed. Women with the condition tend to have heavy periods, since they actually have a bleeding disorder. Severe afflictions may result in the women receiving a hysterectomy unnecessarily, when the underlying cause has not been identified. See the introduction to Von Willebrand's disease and bleeding disorder. Sinusitis is overdiagnosed: There is a tendency to give a diagnosis of sinusitis, when the condition is really a harmless complication of another infection, such as a common cold. Whooping cough often undiagnosed: Although most children in the Western world have been immunized against whooping cough (also called "pertussis"), this protection wears off after about 15 years. Thus, any teen or adult with a persistent cough may actually have whooping cough. This is particularly dangerous for babies too young to be vaccinated, and any un-vaccinated children. Whooping cough can be fatal to an infant. The cough symptoms of whooping cough is usually productive initially, but then becomes a persistent dry cough, lasting up to 100 days. Elderly grandparents may also be a reservoir of undiagnosed whooping cough. Spitz nevi misdiagnosed as dangerous melanoma skin cancer: One possible misdiagnosis to consider in lieu of melanoma is spitz nevi. See melanoma and spitz nevi.

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