Alopecia ( hair loss )

Hair loss- alopecia basics Telogen effluvium. A common presentation in primary care this chart on alopecia on A4Medicine presents the clinician with a structured approach to hair loss.

ANAGEN ( Growth ) Growth phase Resumption of mitotic activity in the hair bulb and dermal papilla Hair length is dependent on the length of anagen Hair grows at an average 1 cm/28 days Scalp hair has the longest anagen phase lasts 3-7 yrs Approximately 90-95 % of scalp hairs are in an active growing phase at any time Hair is large and has pigment

CATAGEN ( involution ) Dynamic transition between anagen and telogen Regression phase- signals end of anagen No hair growth- cell death in follicular keratinocytes- club hair Less than 1 % scalp hairs in this 2-3 weeks transitional phase Hair moves closer to epidermis and takes the form of a club hair

TELOGEN ( shedding ) Resting phase- all activity ceases On scalp- lasts for 2-3 months before anagen 5-10 % of scalp hairs are in teolgen phase Hair can be considered dead will fall out and pushed out by new growing hair Approx 25-100 telogen hairs shed/day ( ↑ on days hair is shampooed ) Normal to...