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{{short description|Endocrine disease}}{{redirect-distinguish|Low T|LOWT}}{{Use mdy dates|date=March 2024}}

factoids

Hypogonadism means diminished functional activity of the gonads—the testicles or the ovaries—that may result in diminished production of sex hormones. Low androgen (e.g., testosterone) levels are referred to as hypoandrogenism and low estrogen (e.g., estradiol) as hypoestrogenism. These are responsible for the observed signs and symptoms in both males and females.Hypogonadism, commonly referred to by the symptom "low testosterone" or "Low T", can also decrease other hormones secreted by the gonads including progesterone, DHEA, anti-Müllerian hormone, activin, and inhibin. Sperm development (spermatogenesis) and release of the egg from the ovaries (ovulation) may be impaired by hypogonadism, which, depending on the degree of severity, may result in partial or complete infertility.In January 2020, the American College of Physicians issued clinical guidelines for testosterone treatment in adult men with age-related low levels of testosterone. The guidelines are supported by the American Academy of Family Physicians. The guidelines include patient discussions regarding testosterone treatment for sexual dysfunction; annual patient evaluation regarding possible notable improvement and, if none, to discontinue testosterone treatment; physicians should consider intramuscular treatments, rather than transdermal treatments, due to costs and since the effectiveness and harm of either method is similar; and, testosterone treatment for reasons other than possible improvement of sexual dysfunction may not be recommended.JOURNAL, Qaseem A, Horwitch CA, Vijan S, Etxeandia-Ikobaltzeta I, Kansagara D, Forciea MA, Crandall C, Fitterman N, Hicks LA, Lin JS, Maroto M, McLean RM, Mustafa RA, Tufte J, 6, Testosterone Treatment in Adult Men With Age-Related Low Testosterone: A Clinical Guideline From the American College of Physicians, Annals of Internal Medicine, 172, 2, 126–133, January 2020, 31905405, 10.7326/M19-0882, 210041462, NEWS, Parry NM, New Guideline for Testosterone Treatment in Men With 'Low T',weblink January 7, 2020, Medscape.com, January 7, 2020, {{TOC limit}}

Classification

Deficiency of sex hormones can result in defective primary or secondary sexual development, or withdrawal effects (e.g., premature menopause) in adults. Defective egg or sperm development results in infertility. The term hypogonadism usually means permanent rather than transient or reversible defects, and usually implies deficiency of reproductive hormones, with or without fertility defects. The term is less commonly used for infertility without hormone deficiency. There are many possible types of hypogonadism and several ways to categorize them. Hypogonadism is also categorized by endocrinologists by the level of the reproductive system that is defective. Physicians measure gonadotropins (LH and FSH) to distinguish primary from secondary hypogonadism. In primary hypogonadism the LH and/or FSH are usually elevated, meaning the problem is in the testicles (hyper-gonatropic hypogonadism); whereas in secondary hypogonadism, both are normal or low, suggesting the problem is in the brain (hypo-gonatropic hypogonadism).{{citation needed|date=August 2020}}

Affected system

• Hypogonadism resulting from defects of the gonads is referred to as hypergonadotropic hypogonadism or primary hypogonadism. Examples include Klinefelter syndrome and Turner syndrome. Mumps is known to cause testicular failure, and in recent years has been immunized against in the US. A varicocele can reduce hormonal production as well.{{citation needed|date=August 2020}}
• Hypogonadism resulting from hypothalamic or pituitary defects is termed hypogonadotropic hypogonadism (HH), secondary hypogonadism, or central hypogonadism (referring to the central nervous system).WEB,weblink Hypogonadism, The Lecturio Medical Concept Library, July 26, 2021,
  • Examples of hypothalamic defects include Kallmann syndrome.
  • Examples of pituitary defects include hypopituitarism and pituitary hypoplasia.
  • An example of a hypogonadism resulting from the lack of hormone response is androgen insensitivity syndrome, where there are inadequate receptors to bind the testosterone, resulting in varying clinical phenotypes of sexual characteristics despite XY chromosomes.
  • Isolated hypogonadotropic hypogonadism (IHH), also called idiopathic or congenital hypogonadotropic hypogonadism (CHH) as well as isolated or congenital gonadotropin-releasing hormone deficiency (IGD) accounts for a small subset of cases of hypogonadotropic hypogonadism (HH) due to deficiency in or insensitivity to gonadotropin-releasing hormone (GnRH) where the function and anatomy of the anterior pituitary are otherwise normal and secondary causes of HH are not present.{{cn|date=May 2022}}

Primary or secondary

• Primary - defect is inherent within the gonad: e.g. Noonan syndrome, Turner syndrome (45X,0), Klinefelter syndrome (47XXY), XY with SRY gene-immunity
• Secondary - defect lies outside of the gonad: e.g. Polycystic ovary syndrome, and Kallmann syndrome, also called hypogonadotropic hypogonadism.{{MedlinePlusEncyclopedia|000390|Hypogonadotropic hypogonadism}} Hemochromatosis and diabetes mellitus can be causes of this as well.

Congenital vs. acquired

• Examples of congenital causes of hypogonadism, that is, causes that are present at birth:{{citation needed|date=August 2020}}
  • Turner syndrome and Klinefelter syndrome. It is also one of the signs of CHARGE syndrome.
• Examples of acquired causes of hypogonadism:{{citation needed|date=August 2020}}
  • Opioid Induced Androgen Deficiency (resulting from the prolonged use of opioid class drugs, e.g. codeine, Dihydrocodeine, morphine, oxycodone, methadone, fentanyl, hydromorphone, etc.)
  • Anabolic steroid-induced hypogonadism (ASIH)
  • Childhood mumps
  • Children born to mothers who had ingested the endocrine disruptor diethylstilbestrol for potential miscarriage
  • Traumatic brain injury, even in childhood
  • In males, normal aging causes a decrease in androgens, which is sometimes called "male menopause" (also known by the coinage "manopause"), late-onset hypogonadism (LOH), and "andropause" or androgen decline in the aging male (ADAM), among other names.
  • It is a symptom of hereditary hemochromatosisWEB,weblink Symptoms, irondisorders.org, March 21, 2018,

Hormones vs. fertility

Hypogonadism can involve just hormone production or just fertility, but most commonly involves both.{{citation needed|date=August 2020}}

• Examples of hypogonadism that affect hormone production more than fertility are hypopituitarism and Kallmann syndrome; in both cases, fertility is reduced until hormones are replaced but can be achieved solely with hormone replacement.
• Examples of hypogonadism that affect fertility more than hormone production are Klinefelter syndrome and Kartagener syndrome.

Other

Hypogonadism can occur in other conditions, like Prader–Willi syndrome.{{cn|date=October 2021}}

Signs and symptoms

Women with hypogonadism do not begin menstruating and it may affect their height and breast development. Onset in women after puberty causes cessation of menstruation, lowered libido, loss of body hair, and hot flashes. In men, it causes impaired muscle and body hair development, gynecomastia, decreased height, erectile dysfunction, and sexual difficulties. If hypogonadism is caused by a disorder of the central nervous system (e.g., a brain tumor), then this is known as central hypogonadism. Signs and symptoms of central hypogonadism may involve headaches, impaired vision, double vision, milky discharge from the breast, and symptoms caused by other hormone problems.{{MedlinePlusEncyclopedia|001195|Hypogonadism}}

Hypogonadotrophic hypogonadism

The symptoms of hypogonadotrophic hypogonadism, a subtype of hypogonadism, include late, incomplete or lack of development at puberty, and sometimes short stature or the inability to smell; in females, a lack of breasts and menstrual periods, and in males a lack of sexual development, e.g., facial hair, penis and testes enlargement, deepening voice.{{citation needed|date=August 2020}}

Diagnosis

Women

Testing serum LH and FSH levels are often used to assess hypogonadism in women, particularly when menopause is believed to be happening. These levels change during a woman's normal menstrual cycle, so the history of having ceased menstruation coupled with high levels aids the diagnosis of being menopausal. Commonly, the post-menopausal woman is not called hypogonadal if she is of typical menopausal age. Contrast with a young woman or teen, who would have hypogonadism rather than menopause. This is because hypogonadism is an abnormality, whereas menopause is a normal change in hormone levels. In any case, the LH and FSH levels will rise in cases of primary hypogonadism or menopause, while they will be low in women with secondary or tertiary hypogonadism.JOURNAL, Carnegie C, 2004, Diagnosis of Hypogonadism: Clinical Assessments and Laboratory Tests

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pmid= 16985909, 1472884, Hypogonadism is often discovered during evaluation of delayed puberty, but ordinary delay, which eventually results in normal pubertal development, wherein reproductive function is termed constitutional delay. It may be discovered during an infertility evaluation in either men or women.JOURNAL, Carnegie C, 2004, Diagnosis of Hypogonadism: Clinical Assessments and Laboratory Tests

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pmid= 16985909, 1472884, Men Low testosterone can be identified through a simple blood test performed by a laboratory, ordered by a health care provider. Blood for the test must be taken in the morning hours, when levels are highest, as levels can drop by as much as 13% during the day and all normal reference ranges are based on morning levels.JOURNAL, Crawford ED, Barqawi AB, O'Donnell C, Morgentaler A, The association of time of day and serum testosterone concentration in a large screening population, BJU International, 100, 3, 509–13, September 2007, 17555474, 10.1111/j.1464-410X.2007.07022.x, 23740125, WEB, UroToday - The Association of Time of Day and Serum Testosterone Concentration in a Large Screening Population, Please Login, May 25, 2010,weblinkweblink" title="web.archive.org/web/20100525121932weblink">weblink May 25, 2010, dead, Normal total testosterone levels depend on the man's age but generally range from 240 to 950 ng/dL (nanograms per deciliter) or 8.3-32.9 nmol/L (nanomoles per liter).WEB,weblink Testosterone, Total, Bioavailable, and Free, Serum, 2016, Mayo Medical Laboratories, Mayo Clinic, December 19, 2016, According to American Urological Association, the diagnosis of low testosterone can be supported when the total testosterone level is below 300 ng/dl.JOURNAL, Mulhall JP, Trost LW, Brannigan RE, Kurtz EG, Redmon JB, Chiles KA, Lightner DJ, Miner MM, Murad MH, Nelson CJ, Platz EA, Ramanathan LV, Lewis RW, 6, Evaluation and Management of Testosterone Deficiency: AUA Guideline, The Journal of Urology, 200, 2, 423–432, August 2018, 29601923, 10.1016/j.juro.2018.03.115, free, Some men with normal total testosterone have low free or bioavailable testosterone levels which could still account for their symptoms. Men with low serum testosterone levels should have other hormones checked, particularly luteinizing hormone to help determine why their testosterone levels are low and help choose the most appropriate treatment (most notably, testosterone is usually not appropriate for secondary or tertiary forms of male hypogonadism, in which the LH levels are usually reduced).{{citation needed|date=August 2020}}Treatment is often prescribed for total testosterone levels below 230 ng/dL with symptoms.JOURNAL, Nieschlag E, Swerdloff R, Behre HM, Gooren LJ, Kaufman JM, Legros JJ, Lunenfeld B, Morley JE, Schulman C, Wang C, Weidner W, Wu FC, Investigation, treatment, and monitoring of late-onset hypogonadism in males: ISA, ISSAM, and EAU recommendations, Journal of Andrology, 27, 2, 135–7, 2006, 16474020, 10.2164/jandrol.05047, free, If the serum total testosterone level is between 230 and 350 ng/dL, free or bioavailable testosterone should be checked as they are frequently low when the total is marginal.{{cn|date=May 2022}}The standard range given is based on widely varying ages and, given that testosterone levels naturally decrease as humans age, age-group specific averages should be taken into consideration when discussing treatment between doctor and patient.WEB,weblink Normal Testosterone Levels In Men - Average Ranges By Age, Hildebrandt B, mens-hormonal-health.com, March 21, 2018, In men, testosterone falls approximately 1 to 3 percent each year.BOOK, Comite F, Florence Comite, Morgentaler A, Keep it up : the power of precision medicine to conquer low T and revitalize your life, 2013, Rodale Books, 978-1609611019, 14,weblink Blood testing A position statement by the Endocrine Society expressed dissatisfaction with most assays for total, free, and bioavailable testosterone.JOURNAL, Rosner W, Auchus RJ, Azziz R, Sluss PM, Raff H, Position statement: Utility, limitations, and pitfalls in measuring testosterone: an Endocrine Society position statement, The Journal of Clinical Endocrinology and Metabolism, 92, 2, 405–13, February 2007, 17090633, 10.1210/jc.2006-1864, free, In particular, research has questioned the validity of commonly administered assays of free testosterone by radioimmunoassay. The free androgen index, essentially a calculation based on total testosterone and sex hormone-binding globulin levels, has been found to be the worst predictor of free testosterone levels and should not be used.JOURNAL, Morris PD, Malkin CJ, Channer KS, Jones TH, A mathematical comparison of techniques to predict biologically available testosterone in a cohort of 1072 men, European Journal of Endocrinology, 151, 2, 241–9, August 2004, 15296480, 10.1530/eje.0.1510241, free, Measurement by equilibrium dialysis or mass spectroscopy is generally required for accurate results, particularly for free testosterone which is normally present in very small concentrations.{{citation needed|date=August 2020}} Screening Screening males who do not have symptoms for hypogonadism is not recommended as of 2018.JOURNAL, Bhasin S, Brito JP, Cunningham GR, Hayes FJ, Hodis HN, Matsumoto AM, Snyder PJ, Swerdloff RS, Wu FC, Yialamas MA, Testosterone Therapy in Men With Hypogonadism: An Endocrine Society Clinical Practice Guideline, The Journal of Clinical Endocrinology and Metabolism, 103, 5, 1715–1744, May 2018, 29562364, 10.1210/jc.2018-00229, free, Treatment Male primary or hypergonadotropic hypogonadism is often treated with testosterone replacement therapy if they are not trying to conceive.In short- and medium-term testosterone replacement therapy the risk of cardiovascular events (including strokes and heart attacks and other heart diseases)is not increased. The long-term safety of the therapy is not known yet.JOURNAL, February 6, 2023, Research provides reassurance about the safety of testosterone treatment,weblink NIHR Evidence, Plain English summary, National Institute for Health and Care Research, 10.3310/nihrevidence_56696, 257851823, JOURNAL, Hudson J, Cruickshank M, Quinton R, Aucott L, Aceves-Martins M, Gillies K, Bhasin S, Snyder PJ, Ellenberg SS, Grossmann M, Travison TG, Gianatti EJ, van der Schouw YT, Emmelot-Vonk MH, Giltay EJ, Hackett G, Ramachandran S, Svartberg J, Hildreth KL, Groti Antonic K, Brock GB, Tenover JL, Tan HM, Kong CH, Tan WS, Marks LS, Ross RJ, Schwartz RS, Manson P, Roberts S, Andersen MS, Magnussen LV, Hernández R, Oliver N, Wu F, Dhillo WS, Bhattacharya S, Brazzelli M, Jayasena CN, 6, Adverse cardiovascular events and mortality in men during testosterone treatment: an individual patient and aggregate data meta-analysis, The Lancet. Healthy Longevity, 3, 6, e381–e393, June 2022, 35711614, 9184259, 10.1016/S2666-7568(22)00096-4, Side effects can include an elevation of hematocrit to levels that require blood withdrawal (phlebotomy) to prevent complications from excessively thick blood. Gynecomastia (growth of breasts in men) sometimes occurs. Finally, some physicians worry that obstructive sleep apnea may worsen with testosterone therapy, and should be monitored.JOURNAL, Matsumoto AM, Sandblom RE, Schoene RB, Lee KA, Giblin EC, Pierson DJ, Bremner WJ, Testosterone replacement in hypogonadal men: effects on obstructive sleep apnoea, respiratory drives, and sleep, Clinical Endocrinology, 22, 6, 713–721, June 1985, 4017261, 10.1111/j.1365-2265.1985.tb00161.x, free, 1790630, 1773/4497, While historically, men with prostate cancer risk were warned against testosterone therapy, that has shown to be a myth.JOURNAL, Morgentaler A, Testosterone and prostate cancer: an historical perspective on a modern myth, European Urology, 50, 5, 935–9, November 2006, 16875775, 10.1016/j.eururo.2006.06.034, Another treatment for hypogonadism is human chorionic gonadotropin (hCG).JOURNAL, Chudnovsky A, Niederberger CS, Gonadotropin therapy for infertile men with hypogonadotropic hypogonadism, Journal of Andrology, 28, 5, 644–6, 2007, 17522414, 10.2164/jandrol.107.003400, free, This stimulates the LH receptor, thereby promoting testosterone synthesis. This will not be effective in men whose testes simply cannot synthesize testosterone anymore (primary hypogonadism), and the failure of hCG therapy is further support for the existence of true testicular failure in a patient. It is particularly indicated in men with hypogonadism who wish to retain their fertility, as it does not suppress spermatogenesis (sperm production) as testosterone replacement therapy does.{{cn|date=October 2021}}For both men and women, an alternative to testosterone replacement is low-dose clomifene treatment, which can stimulate the body to naturally increase hormone levels while avoiding infertility and other side effects that can result from direct hormone replacement therapy.JOURNAL, Whitten SJ, Nangia AK, Kolettis PN, Select patients with hypogonadotropic hypogonadism may respond to treatment with clomiphene citrate, Fertility and Sterility, 86, 6, 1664–8, December 2006, 17007848, 10.1016/j.fertnstert.2006.05.042, free, Clomifene blocks estrogen from binding to some estrogen receptors in the hypothalamus, thereby causing an increased release of gonadotropin-releasing hormone and subsequently LH from the pituitary. Clomifene is a selective estrogen receptor modulator (SERM). Generally, clomifene does not have adverse effects at the doses used for this purpose.{{Androgen replacement therapy formulations and dosages used in men}} See also {{div col|colwidth=30em}} Congenital adrenal hyperplasia due to 21-hydroxylase deficiency Delayed puberty and infertility Hypergonadism (hyperandrogenism and hyperestrogenism) Hypergonadotropic hypogonadism Hypoandrogenism and hypoestrogenism Kallmann syndrome {{div col end}} References {{Reflist}} External links Isolated Gonadotropin-Releasing Hormone (GnRH) Deficiency Overview at National Center for Biotechnology Information. {{MedlinePlusEncyclopedia|001195|Hypogonadism}} {{EMedicine|article|922038|Hypogonadism}} {{Medical resources| DiseasesDB = 21057

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257.2}}| ICDO =| OMIM = 146110| MedlinePlus = 001195| eMedicineSubj = article| eMedicineTopic = 922038| MeshID = D007006| GeneReviewsNBK = NBK1278| GeneReviewsName = Isolated Gonadotropin-Releasing Hormone (GnRH) Deficiency Overview}}{{Gonadal disorder}}