As an auto-immuneFolliclerx disease of the hair, this appears as a rounded patch of thinning hair typically an inch wide and afflicts men and women at any time in their lives. It is usually temporary with most experiencing hair regrowth after but about 20% of those afflicted in the UK suffer permanent hair loss. The disease is triggered by the body’s immune system which looks at hair follicles as foreign to the body and attacks them. White blood cells or T-lymphocytes attack hair follicles to inhibit growth and fall out after three month into its resting or telogen phase. Stopping the white blood cells from attacking the hair follicles will result to regrowth of new hair.
This accounts for 95% of all hair loss cases in both sexes. It is observed that people with genetic predisposition suffer from it and only lately has genetic research confirmed the presence of genes responsible for early hair thinning. The male hormone testosterone, more specifically dihydrotestosterone produced by the enzyme 5 alpha reductase, goes into overproduction in genetically predisposed individuals causing hair follicles to shrink and produce narrow increasingly thinner hair shafts and eventually die out.
This is sudden but swiftly progressive hair loss over a 1-3 week period resulting from chemicals introduced to the body from certain chemotherapy or radiation treatment. Exposure to chemicals like thallium and Arsenic are also known to cause sudden hair loss. It is the side effect of chemotherapy to destroy cancer cells which also causes hair follicles to grow finer and weaker hair or stop growing hair. But this is temporary. Once the chemotherapy is complete, hair grows back to their former abundance though some have reported a different color or texture.
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