Triggers and Types of Telogen Effluvium Hair Loss 

There are several types of telogen effluvium. Environmental factors are a type that is apparent within one to two months and can last up to six months. The second is a slow progression. This type lasts longer and is more noticeable due to a persistent trigger. The third is a cycle of thinning and growth, which does not stay dormant for long. 

Triggers are anything that shocks the system, including:

• stress;
• diet;
• trauma;
• surgery;
• vaccinations;
• pregnancy; and
• antidepressants. 

Lack of iron also may cause the hair follicles to go dormant.