Hair loss
Loss of hair from the head or body From Wikipedia, the free encyclopedia
Loss of hair from the head or body From Wikipedia, the free encyclopedia
Hair loss, also known as alopecia or baldness, refers to a loss of hair from part of the head or body.[2] Typically at least the head is involved.[4] The severity of hair loss can vary from a small area to the entire body.[7] Inflammation or scarring is not usually present.[4] Hair loss in some people causes psychological distress.[3]
| Hair loss | |
|---|---|
| Other names | Alopecia, baldness |
| |
| A bald spot on a man | |
| Pronunciation |
|
| Specialty | Dermatology |
| Symptoms | Loss of hair from part of the head or body.[2] |
| Complications | Psychological distress[3] |
| Types | Male-pattern hair loss, female-pattern hair loss, alopecia areata, telogen effluvium[4] |
| Treatment | Accepting the condition, medications, shaving of balding areas, surgery[4] |
| Medication | Pattern hair loss: minoxidil, finasteride[5] Alopecia areata: steroid injections[4] |
| Frequency | 50% of males, 25% of females (pattern hair loss by age 50)[4][6] |
Common types include male- or female-pattern hair loss, alopecia areata, and a thinning of hair known as telogen effluvium.[4] The cause of male-pattern hair loss is a combination of genetics and male hormones; the cause of female pattern hair loss is unclear; the cause of alopecia areata is autoimmune; and the cause of telogen effluvium is typically a physically or psychologically stressful event.[4] Telogen effluvium is very common following pregnancy.[4]
Less common causes of hair loss without inflammation or scarring include the pulling out of hair, certain medications including chemotherapy, HIV/AIDS, hypothyroidism, and malnutrition including iron deficiency.[3][4] Causes of hair loss that occurs with scarring or inflammation include fungal infection, lupus erythematosus, radiation therapy, and sarcoidosis.[3][4] Diagnosis of hair loss is partly based on the areas affected.[4]
Treatment of pattern hair loss may simply involve accepting the condition, which can also include shaving one's head.[4] Interventions that can be tried include the medications minoxidil (or finasteride) and hair transplant surgery.[5][6] Alopecia areata may be treated by steroid injections in the affected area, but these need to be frequently repeated to be effective.[4] Hair loss is a common problem.[4] Pattern hair loss by age 50 affects about half of men and a quarter of women.[4] About 2% of people develop alopecia areata at some point in time.[4]
Baldness is the partial or complete lack of hair growth, and part of the wider topic of "hair thinning". The degree and pattern of baldness varies, but its most common cause is androgenic hair loss, alopecia androgenetica, or alopecia seborrheica, with the last term primarily used in Europe.[citation needed]
Hypotrichosis is a condition of abnormal hair patterns, predominantly loss or reduction. It occurs, most frequently, by the growth of vellus hair in areas of the body that normally produce terminal hair. Typically, the individual's hair growth is normal after birth, but shortly thereafter the hair is shed and replaced with sparse, abnormal hair growth. The new hair is typically fine, short and brittle, and may lack pigmentation. Baldness may be present by the time the subject is 25 years old.[8]
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Symptoms of hair loss include hair loss in patches usually in circular patterns, dandruff, skin lesions, and scarring. Alopecia areata (mild – medium level) usually shows in unusual hair loss areas, e.g., eyebrows, backside of the head or above the ears, areas the male pattern baldness usually does not affect. In male-pattern hair loss, loss and thinning begin at the temples and the crown and hair either thins out or falls out. Female-pattern hair loss occurs at the frontal and parietal.
People have between 100,000 and 150,000 hairs on their head. The number of strands normally lost in a day varies but on average is 100.[9] In order to maintain a normal volume, hair must be replaced at the same rate at which it is lost. The first signs of hair thinning that people will often notice are more hairs than usual left in the hairbrush after brushing or in the basin after shampooing. Styling can also reveal areas of thinning, such as a wider parting or a thinning crown.[citation needed]
A substantially blemished face, back and limbs could point to cystic acne. The most severe form of the condition, cystic acne, arises from the same hormonal imbalances that cause hair loss and is associated with dihydrotestosterone production.[11]
The psychology of hair thinning is a complex issue. Hair is considered an essential part of overall identity: especially for women, for whom it often represents femininity and attractiveness. Men typically associate a full head of hair with youth and vigor. People experiencing hair thinning often find themselves in a situation where their physical appearance is at odds with their own self-image and commonly worry that they appear older than they are or less attractive to others. Psychological problems due to baldness, if present, are typically most severe at the onset of symptoms.[12]
Hair loss induced by cancer chemotherapy has been reported to cause changes in self-concept and body image. Body image does not return to the previous state after regrowth of hair for a majority of patients. In such cases, patients have difficulties expressing their feelings (alexithymia) and may be more prone to avoiding family conflicts. Family therapy can help families to cope with these psychological problems if they arise.[13]
Although not completely understood,[citation needed] hair loss can have many causes:
Male pattern hair loss is believed to be due to a combination of genetics and the male hormone dihydrotestosterone.[4] The cause in female pattern hair loss remains unclear.[4]
Hair loss often follows childbirth in the postpartum period without causing baldness. During pregnancy, the hair is thicker owing to increased circulating estrogens. Approximately three months after giving birth (typically between 2 and 5 months), estrogen levels drop and hair loss occurs, often particularly noticeably around the hairline and temple area. Hair typically grows back normally and treatment is not indicated.[21][22] A similar situation occurs in women taking the fertility-stimulating drug clomiphene.
Other causes of hair loss include:
Genetic forms of localized autosomal recessive hypotrichosis include:
Hair follicle growth occurs in cycles. Each cycle consists of a long growing phase (anagen), a short transitional phase (catagen) and a short resting phase (telogen). At the end of the resting phase, the hair falls out (exogen) and a new hair starts growing in the follicle, beginning the cycle again.
Normally, about 40 (0–78 in men) hairs reach the end of their resting phase each day and fall out.[28] When more than 100 hairs fall out per day, clinical hair loss (telogen effluvium) may occur.[citation needed] A disruption of the growing phase causes abnormal loss of anagen hairs (anagen effluvium).
Because they are not usually associated with an increased loss rate, male-pattern and female-pattern hair loss do not generally require testing. If hair loss occurs in a young man with no family history, drug use could be the cause.
There are two types of identification tests for female pattern baldness: the Ludwig Scale and the Savin Scale. Both track the progress of diffused thinning, which typically begins on the crown of the head behind the hairline, and becomes gradually more pronounced. For male pattern baldness, the Hamilton–Norwood scale tracks the progress of a receding hairline and/or a thinning crown, through to a horseshoe-shaped ring of hair around the head and on to total baldness.[citation needed]
In almost all cases of thinning, and especially in cases of severe hair loss, it is recommended to seek advice from a doctor or dermatologist. Many types of thinning have an underlying genetic or health-related cause, which a qualified professional will be able to diagnose.[citation needed]
One method of hiding hair loss is the comb over, which involves restyling the remaining hair to cover the balding area. It is usually a temporary solution, useful only while the area of hair loss is small. As the hair loss increases, a comb over becomes less effective.
Another method is to wear a hat or a hairpiece such as a wig or toupee. The wig is a layer of artificial or natural hair made to resemble a typical hair style. In most cases the hair is artificial. Wigs vary widely in quality and cost. In the United States, the best wigs – those that look like real hair – cost up to tens of thousands of dollars. Organizations also collect individuals' donations of their own natural hair to be made into wigs for young cancer patients who have lost their hair due to chemotherapy or other cancer treatment in addition to any type of hair loss.
Though not as common as the loss of hair on the head, chemotherapy, hormone imbalance, forms of hair loss, and other factors can also cause loss of hair in the eyebrows. Loss of growth in the outer one third of the eyebrow is often associated with hypothyroidism. Artificial eyebrows are available to replace missing eyebrows or to cover patchy eyebrows. Eyebrow embroidery is another option which involves the use of a blade to add pigment to the eyebrows. This gives a natural 3D look for those who are worried about an artificial look and it lasts for two years. Micropigmentation (permanent makeup tattooing) is also available for those who want the look to be permanent.
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Treatments for the various forms of hair loss have limited success. Three medications have evidence to support their use in male pattern hair loss: minoxidil, finasteride, and dutasteride.[31][32] They typically work better to prevent further hair loss, than to regrow lost hair.[31] On June 13, 2022, the U.S. Food and Drug Administration (FDA) approved Olumiant (baricitinib) for adults with severe alopecia areatal. It is the first FDA approved drug for systemic treatment, or treatment for any area of the body.[33]
Hair transplantation is usually carried out under local anesthetic. A surgeon will move healthy hair from the back and sides of the head to areas of thinning. The procedure can take between four and eight hours, and additional sessions can be carried out to make hair even thicker. Transplanted hair falls out within a few weeks, but regrows permanently within months.[37]
Hypothermia caps may be used to prevent hair loss during some kinds of chemotherapy, specifically, when taxanes or anthracyclines are administered.[38] It is not recommended to be used when cancer is present in the skin of the scalp or for lymphoma or leukemia.[39] There are generally only minor side effects from scalp cooling given during chemotherapy.[40]
Instead of attempting to conceal their hair loss, some people embrace it by either doing nothing about it or sporting a shaved head.[41][42] The general public became more accepting of men with shaved heads in the early 1950s, when Russian-American actor Yul Brynner began sporting the look; the resulting phenomenon inspired many of his male fans to shave their heads.[43] Male celebrities then continued to bring mainstream popularity to shaved heads,[44][45][46] including athletes such as Michael Jordan[47] and Zinedine Zidane and actors such as Dwayne Johnson,[48] Ben Kingsley,[49] and Jason Statham.[50] Female baldness is still viewed as less normal in various parts of the world.[51][52]
Dietary supplements are not typically recommended.[32] There is only one small trial of saw palmetto which shows tentative benefit in those with mild to moderate androgenetic alopecia.[32] There is no evidence for biotin.[32] Evidence for most other alternative medicine remedies is also insufficient.[53] There was no good evidence for ginkgo, aloe vera, ginseng, bergamot, hibiscus, or sophora as of 2011.[53]
Many people use unproven treatments to treat hair loss.[31] Egg oil, in Indian,[54] Japanese, Unani (Roghan Baiza Murgh)[55] and Chinese[56] traditional medicine, was traditionally used as a treatment for hair loss.[medical citation needed]
Research is looking into connections between hair loss and other health issues. While there has been speculation about a connection between early-onset male pattern hair loss and heart disease, a review of articles from 1954 to 1999 found no conclusive connection between baldness and coronary artery disease. The dermatologists who conducted the review suggested further study was needed.[57]
Environmental factors are under review. A 2007 study indicated that smoking may be a factor associated with age-related hair loss among Asian men. The study controlled for age and family history, and found statistically significant positive associations between moderate or severe male pattern hair loss and smoking status.[58]
Vertex baldness is associated with an increased risk of coronary heart disease (CHD) and the relationship depends upon the severity of baldness, while frontal baldness is not. Thus, vertex baldness might be a marker of CHD and is more closely associated with atherosclerosis than frontal baldness.[28]
A key aspect of hair loss with age is the aging of the hair follicle.[59] Ordinarily, hair follicle renewal is maintained by the stem cells associated with each follicle. Aging of the hair follicle appears to be primed by a sustained cellular response to the DNA damage that accumulates in renewing stem cells during aging.[60] This damage response involves the proteolysis of type XVII collagen by neutrophil elastase in response to DNA damage in hair follicle stem cells. Proteolysis of collagen leads to elimination of the damaged cells and, consequently, to terminal hair follicle miniaturization.
In June 2022 the University of California, Irvine announced that researchers have discovered that hedgehog signaling in murine fibroblasts induces new hair growth and hair multiplication while hedgehog activation increases fibroblast heterogeneity and drives new cell states.[61] A new signaling molecule called SCUBE3 potently stimulates hair growth and may offer a therapeutic treatment for androgenetic alopecia.[62]
The term alopecia (/ˌæləˈpiːʃiə/) is from the Classical Greek ἀλώπηξ, alōpēx, meaning "fox". The origin of this usage is because this animal sheds its coat twice a year, or because in ancient Greece foxes often lost hair because of mange.
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