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.
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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.