Hair loss is the complete or partial loss of hair in one of the areas of the body where hair usually grows, especially the top of the head.
The life cycle of a single hair on the scalp goes through 3 stages, noting that not all hair goes through the same stages at the same time, which are: [1]
Growth Phase (in English: Anagen Phase or Growth Phase): The hair begins to appear in this phase, and the age of the hair in this phase varies depending on the location of the hair. For example, eyebrow hair remains in this phase for approximately 6 months, while scalp hair can remain for a period of time. 6 years at this stage, and the length of the hair increases every month at a rate of about 1 cm.
Transition Phase (in English: Catagen Phase or Transition Phase): This phase begins after the end of the growth phase, where hair growth stops, its length remains the same, the hair cells in it turn into dead cells, and the dermal papillae area turns into a collection of inactive cells and continues for 2 to 3 weeks. .
Telogen phase: The hair and the area of the dermal papillae enter the resting and dormant phase, and the hair length remains constant, lasting from 1 to 3 months.
After the completion of the previous three stages, the hair falls out automatically. This type of hair loss is natural hair loss or caused by pulling factors during washing or hair styling. The hair follicle enters a rest period for several weeks to begin a new cycle of new hair growth from the same follicle.
The hair that we see stuck on the comb, hairbrush, or on the tile floor in the shower is the hair that has ended its natural lifespan, and the normal daily average number of hairs that fall out naturally due to the end of its life cycle ranges from 50 to 100 scalp hairs. This rate of hair loss does not affect the general appearance of the scalp.
An average of 100,000 hairs remain in the scalp every day, and a number of hairs enter the growth phase at the same rate of natural loss every day, and thus the scalp maintains its natural number of hairs.
Types of hair loss
Types of hair loss are divided into the following: [2]
Anagen Hair Loss: In which sudden hair loss occurs in a rapid and severe manner, the patient is accompanied by a complaint of short hair length and not increasing its length for long periods, and empty hair pores appear in the area of hair loss, and an example of this is hair loss after protein.
Telogen Hair Loss: This is severe hair loss after a period of 3 months of pregnancy or taking medications that cause it, and it begins in the form of severe hair thinning followed by loss, especially in the area of the front ends of the scalp, as well as hair loss after childbirth. And hair loss during breastfeeding.
Hair loss associated with skin diseases: Hair loss occurs in areas susceptible to skin diseases only.
Scarring hair loss: It occurs in the form of hair loss in an area forming a scar due to several reasons.
Hereditary hormonal alopecia (Androgenetic Alopecia): It is one of the causes of hair loss in men, and it appears in men in the form of gradual hair loss that increases with age after puberty, starting from the frontal area of the scalp, and is accompanied by severe hair thinning and expansion in the hair parting area in women, especially older women. Age.
Alopecia Areata: Excessive hair loss occurs in specific spots with an average diameter of 1 cm due to autoimmune diseases in most cases.
Hair loss in children: This type occurs for several reasons and may be accompanied by itching and redness of the skin and scaly edges of the affected area. If it occurs, you must consult a doctor to find out the cause associated with this loss.
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