Your hair has a growth cycle that consists of three parts: regeneration, degeneration, and a rest cycle. At times, however, this cycle can be disrupted causing your hair to cease its growth.
Many factors can contribute to hair growth which includes:
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Hormones play a role in promoting hair growth or hair loss. Your hormones also help regulate your hair growth cycle and how long each stage takes to complete.
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Autoimmune Disease known as alopecia areata can cause your hair to stop growing and can also cause you to lose hair from your scalp
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High levels of physical and emotional stress can cause your hair growth to stop and can also play a role in hair loss
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An unhealthy scalp can cause inflammation that makes it difficult for hair to grow
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Genetics, poor diet and age