Primary amenorrhoea (menstrual periods fail to appear
at puberty) may be caused by absence of the uterus or ovaries (e.g.
syndrome) or by a hormonal imbalance.
Secondary amenorrhoea (menstrual periods stop after establishment of puberty) may be caused by:
- disorders of the hypothalamus
- deficiency of ovarian, pituitary, or thyroid hormones
- mental disturbance
- anorexia nervosa
- or by a major change of surroundings or circumstances.
The absence or stopping of the menstrual periods.
(It is normal for the periods to be absent before puberty, during pregnancy and milk secretion, and after the end of the reproductive period.)
See also endocrine conditions and disorders (all on one page).
- Introduction to the Endocrine System
- What is a hormone ?
- Water Soluble Hormones vs Fat Soluble Hormones
- Triggers for Hormone Release
- Hormone Regulation Feedback Mechanism
- Major Glands of the Endocrine System
- The Pituitary Gland
- The Adrenal Glands
- Non-endocrine tissues that release hormones
- Conditions of the Endocrine System