If your child is not starting puberty, or changes seem unusually slow, it can be hard to know what is normal and what may point to an underlying cause. Get clear, parent-friendly guidance on common medical, hormonal, genetic, and growth-related reasons for delayed puberty in boys and girls.
Share what you are noticing about timing, growth, and body changes, and get personalized guidance focused on possible causes of delayed puberty in children and teens.
There is no single reason for delayed puberty. In some children, puberty starts later because of a family pattern called constitutional delay, where growth and development happen on a slower timeline but still follow a healthy course. In other cases, delayed puberty may be linked to low body weight, intense athletic training, chronic illness, nutritional concerns, hormone signaling problems, or conditions affecting the ovaries, testes, pituitary gland, or thyroid. Understanding the cause matters because the next steps can be very different depending on your child's age, growth pattern, and symptoms.
Some children simply mature later than peers, especially if a parent or sibling also had late puberty. This is one of the most common causes of delayed puberty in children.
Problems involving the pituitary gland, hypothalamus, thyroid, ovaries, or testes can affect the hormones needed to start or continue puberty.
Poor weight gain, low body fat, gastrointestinal disease, chronic inflammation, or other ongoing medical conditions can delay normal pubertal development.
What causes delayed puberty in boys often includes constitutional delay, low testosterone production, pituitary hormone issues, chronic illness, or genetic conditions that affect testicular development.
What causes delayed puberty in girls may include constitutional delay, low estrogen production, ovarian conditions, thyroid problems, low body weight, excessive exercise, or chronic disease.
Hormonal causes of delayed puberty, genetic causes of delayed puberty, and medical causes of delayed puberty can affect either sex, though the specific condition and signs may differ.
Parents usually begin looking for answers when there are no clear signs of puberty by the expected age range, when puberty started but then seemed to stall, or when growth is much slower than classmates. It is also common to wonder about delayed puberty causes in teens who are significantly behind peers in breast development, testicular enlargement, growth spurts, body hair, or menstrual onset. A careful review of growth history, family timing, nutrition, exercise, and medical symptoms can help narrow down the most likely explanation.
A long pattern of short stature or poor growth may suggest a broader growth, nutrition, or hormone-related issue rather than a simple late start.
If some changes have appeared but progress is very slow or incomplete, that can help distinguish between normal variation and conditions that cause delayed puberty.
Fatigue, weight loss, headaches, digestive symptoms, excessive exercise, or a history of chronic illness can offer important clues about reasons for delayed puberty.
One of the most common causes is constitutional delay, meaning a child develops later than average but is otherwise healthy. Other causes include chronic medical conditions, low body weight, nutritional issues, thyroid problems, pituitary hormone disorders, and conditions affecting the ovaries or testes.
In boys, delayed puberty is often caused by constitutional delay, especially when there is a family history of late development. It can also be related to low testosterone production, pituitary hormone problems, chronic illness, or certain genetic conditions.
In girls, delayed puberty may be caused by constitutional delay, low estrogen production, ovarian conditions, thyroid disease, low body fat, high levels of physical training, chronic illness, or nutritional concerns.
Yes. Some children inherit a family pattern of later puberty, while others may have specific genetic conditions that affect hormone production or the development of the reproductive system. Family history can be an important clue.
Yes. Conditions such as inflammatory bowel disease, celiac disease, thyroid disorders, diabetes, pituitary disorders, and other chronic illnesses can contribute to delayed puberty causes in teens by affecting growth, nutrition, or hormone signaling.
A child who seems healthy may still have a normal late pattern of development, especially if puberty was also late in close family members. But if there are concerns about growth, weight, energy, or no signs of puberty by the expected age range, it is reasonable to look more closely at possible hormonal, nutritional, or medical causes.
Answer a few questions about your child's growth, timing, and symptoms to better understand possible reasons for delayed puberty and what factors may be most relevant for boys, girls, and teens.
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Delayed Puberty
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