Hypogonadism

Hypogonadism means diminished functional activity of the gonads, 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.

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.
Spermatogenesis and Ovulation may be impaired which causes complete infertility.

LH and/or FSH are usually elevated, since the problem is in the Testicles / Ovaries (Hyper-gonatropic hypogonadism)
Genetic: Klinefelter syndrome,Turner syndrome, Noonan syndrome, XY with SRY gene-immunity
Acquired: MMP

Hypogonadotropic hypogonadism (HH) due to Hypopituitarism / Pituitary hypoplasia.
Central hypogonadism referring to CNS / Hypothalamic defects: Kallmann syndrome
Lack of hormone response is AIS (Androgen Insensitivity Syndrome)
Isolated hypogonadotropic hypogonadism (IHH)= Idiopathic or congenital hypogonadotropic hypogonadism (CHH): HH due to deficiency in or insensitivity to GnRH where the function and anatomy of the anterior pituitary is normal and secondary causes of HH are not present
In secondary hypogonadism, LH / FSH are normal or low, suggesting the problem is in the brain (Hypo-gonatropic hypogonadism
E.g. PCOS, and Kallmann syndrome. Hemochromatosis and Diabetes mellitus can be the etiology.

It may be due to:

Genetic disorders, such as Kallmann syndrome (abnormal hypothalamic development)
Infections, including HIV
Pituitary disorders
inflammatory diseases, including sarcoidosis, MTB, and histiocytosis

Hypogonadism can involve just hormone production or just fertility, but most commonly involves both.

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.

Hypogonadism can occur in other conditions, like Prader–Willi syndrome.^{[citation needed]}

Women: Amenorrhea, Decreased height+ Impaired Breast development Or Cessation of menstruation + Lowered libido + Loss of body hair + Hot flashes.
Men: Impaired muscle + Impaired body hair development + Gynecomastia + Decreased height + Erectile dysfunction + Sexual difficulties.
Central hypogonadism: Headaches + Impaired vision / Double vision + Milky discharge from the breast (Prolactin) + Symptoms caused by other hormone problems.

It is a subtype of hypogonadism,
Late, incomplete or lack of development at puberty
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.

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