6. Issue: Dandruff 头皮屑

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.

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。

7. Issue: An unexpected bald patch of hair 意想不到的秃顶

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.

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。

8. Issue: Thicker hair than you've ever had before. 头发比以前更密

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!

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！