From the Guidelines
The normal rate of hair growth is approximately 1 cm/month.
Hair Growth Cycle
The hair growth cycle consists of three phases, but the exact duration of each phase is not specified in the provided evidence.
- However, it is known that hair will start growing again 2-3 months after certain therapies are completed, and grow at a rate of approximately 1 cm/month 1.
Hair Shedding
On average, the normal rate of hair shedding is not explicitly stated in the provided evidence, but it is mentioned that changes in hair growth and shedding can occur due to various therapies.
- For example, certain therapies can cause diffuse grade 2 alopecia on the entire scalp, and changes in color and texture in newly grown hair 1.
Important Considerations
It is essential to note that 65% of patients report changes in color and texture in newly grown hair after certain therapies 1.
- Additionally, hair damage caused by certain therapies can lead to alopecia by rapid transition into dystrophic telogen or catagen stages, driven by a p53-mediated apoptosis of hair matrix keratinocytes and stem cells 1.
From the Research
Normal Rate of Hair Growth and Shedding
There are no research papers to assist in answering this question. The provided studies do not discuss hair growth or shedding, but rather focus on topics such as growth hormone therapy 2, thyroid cancer 3, dietary protein intake 4, bone loss around dental implants 5, and the effects of training on growth in adolescent athletes 6.