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Having an erection is natural, so when that ability is lost, it’s a sign that something has gone wrong. 勃起是自然的事情,因此当这种能力丧失时,这种迹象表明身体出毛病了。 Men may find it difficult or impossible to achieve an erection when the nerves have been damaged by a radical prostatectomy or spinal cord injury. Performance anxiety can trigger erectile dysfunction in a young man. 当前列腺切除术或脊髓损伤造成神经损伤时，男人可能很难或不可能达到勃起。在年轻人中，这种焦虑会引起勃起功能障碍。 But when a man in his 40s or older gradually begins having difficulty achieving an erection, the underlying cause is nearly always cardiovascular disease or diabetes mellitus. 然而当一个男人40岁或更大时，逐步开始有勃起困难,根本原因差不多总是心血管疾病或糖尿病引起的。 | 
