Scientists found men who worked more than 52 hours a week lost their hair at twice the speed of those who spent less than 40 hours in the office. They say it is likely stress caused by too much work and not enough downtime that is the main cause.
The research, which examined more than 13,000 employed men, is believed to be the first to look specifically at the impact of long working hours on hair loss. Changes in hormone levels which occur during stress can wreak havoc on several areas of the body. When these extra hormones are made, they can inhibit the growth patterns of the hair follicles on your scalp.
Previous studies have shown stress to cause the immune system to attack these follicles, for reasons that are not yet known. It is also thought stress causes the hair to prematurely enter the catagen, or 'resting phase', the end of the active growth of hair. Because no new hairs are growing at this stage, if they fall out then a bald patch is left in their place.
Source: HERE