Tumours that produce hormones can throw off this Balance. Diseases of the endocrine system result from over- or underproduction of a hormone or an abnormal response to a hormone.

• 肿瘤产生的荷尔蒙会打乱这种平衡关系。内分泌系统疾病是由于荷尔蒙分泌过量或不足引起,或因对荷尔蒙不正常的反应。