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      Product Reviews

      • 毛发脱落
        HairLoss September 9, 2017
        0 871

        常见脱发类型

        1周期性脱发 一般说来，普通人每天都会有50～100根左右的头发会掉落。人类毛发的生长是有周期性的，过了成长期之后，毛发会自然掉落，但成长期的头发，是不会轻易掉落的。生长期的头发的毛根，被一种称为毛包，宛如毛髓鞘样的物质包住，使毛根紧紧地停留在毛孔中。但是，过了生长期之后，毛根渐渐萎缩，埋在皮肤里的部分非常的短，而毛包也松弛，因此形成容易掉落的状态，梳头发等轻微的拉扯就可能使头发脱落。这就是毛发的周期结束，旧毛出现生理的掉发现象，称为自然脱发。由于每个毛囊的生长周期不尽相同，因此全部的头发约有17%的毛囊处于休止期，也就是每天约有50至100个毛囊进入休止期，此时期发干不但长度不变，又处于容易因外力抓拉而脱落的脆弱阶段，若用力梳头、或洗发时抓力过大，都可使处于休止期的毛发脱落。 2休止期脱发 当人遭逢过大的压力，如生产、考试或家人去世等重大变故时，毛囊由生长期进入休止期的数目会增加，其比例可高达75%，基于休止期头发较易脱落，可能在短时间就掉落1/3至1/2的发量。　　当压力逐渐减低或消除时，休止期的毛囊会重新进入生长期，继续生长头发的使命。产后掉发是属于典型的休止期脱发，头发会一下子掉很多但不会全部掉光。产妇掉发一般发生在产后1—4个月之间。掉发时间持续不会超过6个月，不过有时候会延长到1年的时间。临床上看到的是弥漫性或广泛性的掉发，病人常抱怨每天大量脱发，担心头发全部掉光。事实上，因为休止期脱发只是休止期毛囊增加，因此生长的头发较少，当这些休息的毛囊几个月后陆续又重新进入生长期时，头发自然就会重新长出。只不过因为每天才长0.03公分，因此要完全恢复到怀孕前的盛况也需一年以上的时间。 产后秃发的原因可能是生产所造成的压力、出血及内分泌的变化皆可能使较多的生长期毛囊进入休息状态，而产生休止期秃发。如果在怀孕过程有蛋白质缺乏、必须脂肪的缺乏或缺铁性贫血时，也会造成掉发现象。 3男性型脱发 这是男性较常见到的掉发原因。成因主要有：遗传因素、男性荷尔蒙、年龄(青春期以后)。男性通常表现成发际线往后移，最后变成地中海型。女性则表现成头顶毛发稀疏，但是形成的年龄比男性晚些。但因女性缺乏足够的雄性激素，症状往往不会太严重。男性脱发出现的时间，落发快慢及其严重性，个人差异很大。在男性年龄大时，前额头发渐少，发际往上移，似乎被认为是老化的自然现象，但同样的情形，发生在年轻人，则令人感到困扰。 4圆秃 圆形区域的头发掉落，俗称鬼剃头，头发突然脱落，呈现单个或多个圆型光秃处，原因不明，但多认为是自体免疫机制与情绪压力有关，愈后良好，只有很少数会发展成全秃。发病时，通常受到心理压力或身体状况有问题，掉发时一般没有自觉性症状。 5病理性、外科手术或 全身性疾病所致 高烧、代谢不正常、大量出血、休克等严重之疾病发生两三个月，毛发突然脱落，通常两个月会恢复。营养不良、铁缺乏等，亦同时影响头发的生长。内分泌的病变，如脑下垂体、甲状腺、副甲状腺、肾上腺皮质或卵巢等的分泌异常或肿瘤，糖尿病等亦可引起秃发，原来疾病治疗后，营养调整后，大都可恢复。 6皮肤病、传染病及免疫疾病 如红皮症、全身性或盘状红斑痕疮、脂溢性皮肤炎等会导致头发脱落。梅毒、痲疯、霉菌、细菌感染也会造成落发。甲状腺疾病、自体免疫性疾病、白血病、贫血也会影响毛发生长。 7情绪问题 日常饮食摄取不均，营养不足及不正常的生活习惯(如熬夜、烟酒过量、运动过度……)均会引起脱发。当人情绪处于紧张、焦虑时，皮脂腺活动旺盛，头皮分泌失调，毛囊受损，也会造成掉发。 8生长期脱发 生长期脱发是掉发种类中较严重的现象，常是全部毛发一根不留的掉光，其因大多如癌症患者接受化学药物治疗期间，所引发的落发现象，所幸此类病患在停止用药后，头发多能重新长回。许多药物会造成生长期秃发，如抗癌药物等，会抑制毛发生长，常在用药一至二星期后即见脱发，毛干变细及断落。 一有些脱发会自动长回来，如产后脱发、压力性脱发。 二压力大造成的脱发可给予镇静剂，帮助舒缓压力；容易紧张的病人，则可给予安慰剂。…

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