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Puberty begins when the hypothalumus, which is part of the brain, produces a hormone that stimulates the pituitary gland, which then produces hormones called gonadotrophins that stimulate the gonads and adrenals. Gonads are the testes in males and the ovaries in females. The gonads then produce a flood of sexual hormones that stimulate growth and development of the sexual organs of both genders and in the breasts of females.

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===Precocious puberty===

Puberty sometimes starts early. When it does, it is called precocious puberty. Puberty that starts before eight years in girls and nine years in boys is considered to be precocious puberty.<ref name="cleveland2024" />

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==Tanner stages==

Dr James Tanner, a British paediatric endocrinologist, created Tanner stages, which describes the progress of puberty through five stages.<ref name="cleveland2024" /> <ref>{{REFbook

==End of puberty==

Puberty typically lasts for 2 to 5 years. It usually ends for girls at age 15 to 17, and for boys at age 16 to 17.<ref name="cleveland2024" />

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* {{URLwikipedia|Puberty|Puberty}}

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[[Category:Education]]