• The life of a hair
• Androgenetic hair thinning
• Reactional hair thinning

This mainly affects women.

Hair loss starts abruptly; it may last a few weeks to several months. It is initially random, but can lead to a more visible loss of volume if it continues.

Reactional hair thinning is the result of a few causes :

• Mental stress
• Fatigue
• Childbirth
• Physical stress
  (illness, severe fever, accident, etc.)

• Hormonal changes
• Slimming diets, yo-yo effect
• Deficiencies in trace elements and vitamins
• Medication
  (anticoagulants, thyroid inhibitors, antirheumatics, antimitotics)

It is accompanied by a loss of hair density.
This situation can, in some cases, mark the start of chronic hair loss, with hair becoming increasingly thin.