人的头发是周期性生长的。但是,如果每天脱发超过100根,且持续超过两个月以上,基本可以确诊为脱发。脱发的主要症状是头皮油腻,毛囊萎缩,头发脱落,易断,油多无弹性。若是男性脱发,主要是前头与头顶部,前额的发际与鬓角往上移,前头与顶部的头发稀疏、变黄、变软,额顶部一片光秃;女性脱发在头顶部,头发变得稀疏,但不会像男性一样“前秃”。造成脱发的原因很多,包括先 Human hair is cyclical growth. However, if more than 100 hair loss occurs daily for more than two months, hair loss can be diagnosed. The main symptoms of hair loss is oily scalp, hair follicles shrink, hair loss, easily broken, the oil more inelastic. If male hair loss, mainly the front and head top, forehead hair and temples move up, the front and top of the hair thinning, yellowing, soft top amount of a bald; female hair loss in the top of the head, the hair becomes sparse , But not like men “bald”. Cause hair loss for many reasons, including the first