Catagen phase starts mysteriously at the end of the Anagen phase. This phase is also known as the transition phase. When this phase starts, the hair stops growing. It is totally unclear what exactly triggers the start of this phase.
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Other pages related to Catagen phase
The active growing time in the hair growth cycle is called the anagen phase. It is sub-divided into the pro-, mes- and met-anagen phases.
After the catagen phase comes the telogen phase. At the end of this phase the hair falls out and the whole process starts over again.
Read more about the effects of melanin on both hair and skin.