Anagen and Telogen Effluvium – premature hair fall resulting in diffuse hair fall throughout the scalp. A condition that in most case will require treatment. We are a team of specialists that have treated thousands of sufferers over the years in practice. Feel free to contact the advice line and speak with a trichologist in person. Remember, the sooner you know exactly what you are dealing with the sooner you can get it dealt with.
In order to fully understand the factors surrounding anagen and telogen effluvium it is necessary to know the stages of hair growth in hair cycle
Hair Growth Cycle
Scalp hair-follicles have a four phase cycle. Anagen (growth), Catagen (transition), Telogen (resting) and Exogen (hair-shaft evacuation).
The Anagen Phase – During the process of folliculo-regenesis, the follicle + epithelial sheath + new hair shaft is recreated. During its growth (anagen) phase the hair shaft continues to gain length for a period of 2-7 years. Approximately 80-85% of hair follicles are in anagen. Hair growth rates range from 0.5cm – 1.45cm per month.
The Catagen Phase – mitosis ceases, the follicle enters a period of degeneration. Catagen accounts for approximately 3% of hair follicles. The Epithelial sheath shrinks forming a minute “club root” at the proximal end of the hair shaft. Catagen lasts for approximately 10-20 days.
The Telogen Phase – approximately 12-20% of hairshafts are in the amitotic (resting) phase. Eventually (up to 3 months ) the hair shaft vacates the follicle.
The Exogen Phase – in which the hair-shaft is evacuated.
Anagen Effluvium – hair loss during anagen – the onset may be rapid (within 2-4 weeks of the cause). Hair loss may be severe. Causes include:- Chemotherapy drugs (antimitotic agents), Radiotherapy, Malnutrition, Seborrhoeic dermatitis, Oral contraceptives, Vitamin A poisoning, Iron deficiency, Chronic infections and some drugs.
Telogen Effluvium – relating to a specific form of diffuse alopecia – eviction of hairs hafts that have prematurely entered the telogen phase. Excessive loss of hair can occur. Telogen Effluvium tends to become apparent 6-12 weeks following the cause. Such a hair loss can result in 1-2cm stubble in extreme cases within weeks. Causes include: Pyrexia (body temperature reaching 103.5 C +), Childbirth (rare), severe infection (especially toxaemia), major surgery, protein deficiency due to unsupervised crash diets, drugs including beta blockers, anti-depressants, severe psychological stress.