| Primary (testicular) | Secondary (central i.e. disturbances in the regulation of the hypothalamic-pituitary-testicular axis) |
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Organic | - Klinefelter's syndrome Klinefelter's Syndrome
- Cryptorchidism Undescended Testicle, anorchia
- Cancer drugs, radiation-induced testicular injury or status post-orchiectomy
- Orchitis, testicular injury or torsion
- Impact of aging on testis
| - Hypothalamic or pituitary tumours Pituitary Tumours
- Hemochromatosis Haemochromatosis
- Infiltrating or destructive diseases of the hypothalamus or pituitary gland
- Idiopathic hypogonadotropic hypogonadism
|
Functional | | |