头发的好坏反是身体内部的表现

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"Hair reflects internal changes--things like sickness, nutrition and stress," says dermatologist
Paradi Mirmirani, M.D., a faculty member of the American Academy of Dermatology. There are
three parts to your hair: the hair shaft (the fiber), the hair bulb (the root) and the hair cycle (the
period of rest and regeneration). Most problems are related to one of these three things, says
Mirmirani.
美国皮肤学会教员、皮肤科医学博士马诺莫尼表示：“头发可以反映出身体内部的变化——比如疾病、营养和压力。” 我们的头发包含三个部分：毛干(纤维)，毛球(根部)和毛发周期(休息和再生的周期)。马诺莫尼表示，大多数的头发问题都与其中的某个部分相关。

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Issue: Brittle or easily breaking hair

Some hairstyles can actually affect the health of your hair's bulb, Dr.
Mirmirani says. She sees this a lot with hair extensions or ponytails
pulled too tight, day after day. "Think of it this way, if you keep pulling
on the bulb of a plant, eventually, you can damage it," she says. Take it easy when you're pulling
your hair back, and don't brush your hair vigorously when wet. Use a wide-tooth comb and
comb through gently. As for Marsha Brady's 100 strokes a day for shine? Not so much,
Mirmirani says. The less brushing, the better.

头发变脆容易断裂
马诺莫尼医生指出，有些发型实际上会影响到你发球的健康。她看到许多人日复一日地拉伸头发或者把马尾绑得太紧。她说：“想想看，如果你一直拉植物的根部，那么植物最终将被损坏。”向后拉头发的时候手要放松，头发湿的时候不要用力地梳头发，使用宽齿梳子轻轻地梳。效仿玛莎·布雷迪为了头发亮泽，一天梳头100次？马诺莫尼医生说这样是不对的。梳得越少越好。

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4 Issue: Split ends

Split, or "dead" ends are the result of damaged or weathered
hair. "The hair splays apart because the outer layer (or cuticle) of the
hair shaft has worn away," Dr. Mirmirani says. But the good news is,
you can snip them right off, and immediately your hair will look healthier. Another trick is to keep
your ends well-conditioned. Remember there is a difference between the function of cleansing
and conditioning: Shampoo is for your scalp, and conditioner is for the actual hair fibers
.
4.头发末梢分叉
分叉或死亡的头发末梢是头发受损或风干造成的。马诺莫尼医生说：“头发分叉是因为毛干的表层(或角质层)已经损坏。”但是好的一面是，你可以立即剪掉它，然后你的头发立刻看起来更加健康。另一个窍门是妥善调理你的发梢。记住清洗和调理的功能是不同的：洗发水是针对你的头皮，而护法素实际是针对头发纤维。

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5 Issue: Gray hair

The unavoidable truth is that gray hair is genetic, and aside from
coloring, you're stuck with it. Most people only have a handful of hair
cycles (remember, a cycle is 6 - 8 years) where the
pigment-producing cells that surround the follicle and transfer pigment are working at their best.
The process just gets . . . tired. Dr. Mirmirani can't confirm the old wives' tales that tell you if you
yank one gray hair, five more will sprout up. However, once a fiber is gray--even if you pluck it--it
will more than likely grow back in gray again.

5.白发
你应该坚信，除了染色外，白发是遗传的，这是不可避免的事实。大多数人的头发周期不长(记住，一个周期是6 -8年)，此时色素细胞包围毛囊，色素的产生处于最佳状态。然后过程变得......疲劳。马诺莫尼医生不能确认老妇人讲的如果你拔一根白发，五根将会长出来的传言。然而，一旦头发纤维变白，即使你拔掉头发，长出来的很可能还是白头发。

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6 Issue: Dandruff

Dandruff can be hereditary, but it's still a mystery what causes the flaky stuff.
Daily shampooing is your first line of defense, but if the itchiness and flakes
persist, try an anti-dandruff product. Dr. Mirmirani cautions sparing use of
these products, however, because they are very harsh to your hair fiber. Try
alternating the anti-dandruff product with regular shampoo until the dandruff
clears up, and then switch back to your regular shampoo.

6. 头皮屑
头皮屑可以遗传，但什么原因导致了片状东西的产生还是一个谜。每天洗头是你的第一道防线，但是如果发痒且头屑一直存在的话，就去试试去屑的产品。但是，马诺莫尼告诫大家要谨慎地使用这些产品，因为它们对你的头发纤维刺激性很大。用去屑产品替代常规洗发水，一旦头皮屑清除，就换回常规洗发水。

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Issue: An unexpected bald patch of hair

You may have Alopecia Areata, which occurs when your immune
system starts attacking the hair bulbs. It doesn't destroy it, but the bulb
won't start to grow again until the attack is called off. According to the
National Alopecia Areata Foundation, it affects five million people in
the U.S. "It could be stress or it could be environmental factors -- we really don't know," Dr.
Mirmirani says. It can happen one time or recur with some frequency.  If you find a sudden bald
spot, see your dermatologist.

意想不到的秃顶
当免疫系统开始攻击毛球，你可能出现秃发现象。免疫系统并没有摧毁它，但是毛球在攻击停止之前不会再生长了。根据全国秃发基金会的数据显示，秃发影响到在美国的500万人。马诺莫尼医生说：“至今我们不知道确切的原因，这可能是压力或者环境因素造成的。”秃发可能发生一次也可能以一定的频率发生。头发还能变黑因为这不是永久性的损坏。如果发现突然性的秃发，请去找皮肤科医生。

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Issue: Thicker hair than you've ever had before.

Either you're just super lucky, or you're about to have a baby. Sure,
the hormones of pregnancy can make you lose your lunch, but they
are also the cause behind the thick, lustrous hair you'll probably notice
if you're expecting. When you're pregnant, your hair stays in a high state of
hair growth, with only minimal hair loss. Enjoy it while it lasts!

头发比以前更密
要么你只是超级幸运，或者你即将有一个孩子。当然，孕激素使你对午餐失去胃口，但是你可能注意到它们也是你头发变得浓密有光泽的原因。当你怀孕后，你的头发会保持高增长的状态，只有很少的头发会脱落。享受这段头发持续高增长的时光吧！
。

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Issue: Excessive hair shedding

Each individual strand of hair has its own cycle, growing for six to
eight years, resting for a few months, and then shedding. "About 10
percent of your hair is shedding at any one given time," Mirmirani
says, pointing out that many things can interrupt the cycle and cause more hairs to shed earlier,
including stress, fever, weight loss  or low iron levels. If you're noticing more shedding than
usual, examine your lifestyle to see what might have changed or consult your dermatologist for
tests.

脱发严重
每根头发都有它自己的生长周期，生长6-8年后，停止生长几个月，然后脱落。马诺莫尼说：“百分之十左右的头发会在任何一个特定的时间脱落。”她指出，压力、发烧、体重减轻或缺铁等因素都会打断头发的生长周期，并使更多的头发提早脱落。如果你发现头发脱落比平时更多，检查一下自己的生活方式，看看发生了什么改变或者咨询一下皮肤科医生。