There are two main types of amenorrhea:

Primary amenorrhea:  This is a rare condition wherein a girl is late from normal

Secondary amenorrhea:  This is when a girl having regular or irregular periods tends to miss her periods for three or more months in a row without any specific condition.

What are the causes of amenorrhoea?

Various possible causes and risk factors for primary amenorrhea include:

• Family history of amenorrhea or early menopause
• Genetic or chromosomal defect
• Medical conditions such as PCOS, heart disease, cystic fibrosis etc
• Having very low or high body fat
• Prolonged chronic illness likewise thyroid, anemia, chlorosis, tuberculosis, diabetes etc

Common causes of secondary amenorrhea are as follows:

• Natural changes in the body can cause periods to stop, for instance during pregnancy and breastfeeding.
• Menopause
• Use of certain forms of birth control like contraceptive pills etc
• Extreme emotional stress
• Certain medications such as antidepressants and blood pressure medicines
• Chemotherapy and radiation treatments
• Excessive exercise
• Hormonal deficiency or imbalance
• Problems with the ovaries
• Uterine scar tissue.