I.  Primary causes         

1. a genetic or

2. anatomic condition

3. Premature ovarian failure 

ii. Secondary causes   

1. Consumption diseases   

2. Weight fluctuation       

3. Stress         

4. Rigorous exercises

5. Hypothyroidism    

6. Ovarian disease

I. 原因

1. 先天因素

2. 生理情況

3. 卵巢早衰

II. 誘因：

1. 消耗病

2. 體重波動

3. 精神壓力

4. 劇烈運動

5. 甲狀腺功能低下

6. 卵巢病症

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