Thelarche

Thelarche means the development of breasts in human females during puberty (sexual development).[1]

Thelarche

Thelarche means the development of breasts in human females during puberty (sexual development).[1]

Development

See also: Puberty

Generally, the left breast is the larger of the two in females.[2] This usually begins when girls are about 9.[3] A lump that is a bit hard appears in each breast under the areola, which is the dark ring around the nipple. The lump in one breast may grow before the other one.[4] This is called breast budding.[5] Within 6-12 months, both breasts will have started growing. The swelling can be felt and seen outside the edges of the areolae. About 1 and a half to 2 years after the breasts first start growing, they are close to the shape and size of an adult woman's breasts. The nipple and areola may be on a smaller mound on each breast. This small mound usually goes away when each breast is fully grown.[6] Breast size depends on the body's amount of fat[5][7] the woman has.

After thelarche, the breasts continue to grow. Development stops usually around age 17.[8]

Thelarchic stage

It is the Tanner 2 stage of breast development (a scale used to analyze changes in people from childhood to adulthood). The first stage is the non-developed prepubescent state of breasts. Thelarche is usually the first sign of puberty. It usually occurs after age 8, and is the first evidence of puberty in 60% of women. It usually ends at age 13.[9] However, it can sometimes happen earlier. When this happens, it can be by itself (called isolated premature thelarche).[10] It could also be a wider pattern of precocious puberty (sexual development happening too early).

Hormones

Main article: Sex hormone
See also: Hormone

The process is started by estradiol, the primary female sex hormone. Many young women are not prepared for thelarche, and this may result in stress.[11] Teaching materials on breast development for elementary and middle schools has been suggested to promote breast health by reducing shame.[12]

References

  1. ↑ Merriam Webster defintion http://www.merriam-webster.com/medical/thelarche
  2. ↑ Loughry, C. W.; Sheffer, D. B.; Price Jr, T. E.; Bartfai, R. G.; Morek, W. M.; Lackney, M. J.; Bolyard, B. R. (1987). "Right and left breast volume and volume distribution comparisons in normal and tumor-containing breasts". Cancer Detection and Prevention. 10 (3–4): 215–221. PMID 3568018.
  3. ↑ Olson, Ginny Teenage Girls: Exploring Issues Adolescent Girls Face and Strategies to help them https://books.google.com/books?id=miQ5iJnXDKkC&pg=PT30&dq=girls+breasts+start+growing+10+years
  4. ↑ Marshall, Human Growth, p. 187.
  5. ↑ 5.0 5.1 Anne Byers (2007). "How do Girls' Bodies Change during Puberty?". Frequently Asked Questions about Puberty. New York, N.Y.: Rosen Publishing. pp. 26–33 at 27. ISBN 978-1-4042-0966-4..
  6. ↑ Marshall, Human Growth, p. 188.
  7. ↑ See also "Normal breast development". 007 Breasts. Retrieved 2 May 2010.
  8. ↑ "How breasts develop during puberty". Breast Cancer Now. Retrieved 2026-04-05.
  9. ↑ Glass' Office Gynecology, edited by Robert Glass et al, page 15.
  10. ↑ Isolated Premature Thelarche http://www.health.am/gyneco/more/isolated-premature-thelarche/
  11. ↑ Golub, Sharon (ed) 1983. Menarche: the transition from girl to woman. Lexington Books, Toronto.
  12. ↑ Sex Hysteria. https://sexhysteria.wordpress.com/2011/09/01/breast-shame-tradition-deception-and-the-money-trail/
The Simple English Wiktionary has a definition for: thelarche.

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