男孩为什么也会乳房发育

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<table cellspacing="0" cellpadding="0" width="98%" border="0"><tr><td class="title-text" align="center" width="100%">男孩为什么也会乳房发育</td></tr><tr><td class="text" align="center" width="100%" height="1"></td></tr><tr><td class="text" align="center" width="100%"><font color="#999999">2005年02月21日 12:08:43</td></tr><tr><td width="100%" height="1"></td></tr><tr><td class="content" valign="top" width="100%"><p align="right"><font color="#0000ff">文/军衡 青春期像一个魔术师，它会使男女孩子的身体发生日新月异的变化。生理的发育来得很迅速，产生一个生长发育高峰，许多生理现象使少男少女感到迷惑甚至恐惧，例如乳房的发育。 男孩进入青春期后，体内大量分泌雄激素的同时，雌激素的分泌也随之增加。在这个阶段，雌激素常比雄激素先增高，出现性激素的比例失调。 因此，在进入青春期后一年左右，由于雌激素的升高，加上生长激素和肾上腺皮质激素对乳腺也产生刺激作用，从而使男孩乳头部位的乳腺细胞增大、分裂、数量增多，使乳房隆起；仔细抚摩，还会发现里面有一个小硬结，偶尔触碰会产生痛感。这种现象一般可持续1-2年时间。 男性乳房增生表现为双侧性对称或不对称增大，也有单侧性增大，一般无不适，但有时可伴有胀痛。对青春期孩子来说，它称为&ldquo;特发性男性乳房增生&rdquo;，等到发育后期往往会自行消退，不必担忧，也不必进行治疗。 但是，除上述生理性的原因以外，偶有病理性增生，如患肝脏疾病、睾丸功能低下、肾上腺病症、甲状腺病、肿瘤等的男性患者也可能出现乳腺增生。如果增生的乳腺长时间不消退，或继续增大，并伴随身体其他方面的不适，就需要去医院请大夫诊治了。</td></tr></table>

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