If lots of hair begins to fall out throughout the scalp, it’s obviously due to a change in the normal hair cycle: either a short anagen phase or an increase in the number of  follicles that enter the telogen phase. When the majority of hair follicles “go telogen” it’s called telogen effluvium or stress alopecia. A shock to the body’s system, which stresses the hair follicles, is often to blame for this change in cyclical hair events. Two to three months after the stressor hits, up to 70 percent of hairs can enter the telogen phase and commence a massive “fall out”. There are a number of shocks that are known to cause this.