月經 

是沒有懷孕時子宮內膜自行排出體外的身體自然機制。

子宮頸 

位於子宮底部，連接陰道。在月經期間，子宮頸會較非經期結實、位置會較非經期稍低。

陰道

由肌肉形成的通道狀器官。陰道本身有彈性，功能包括讓經血流出、分娩時作為產道、以及插入式性行為。陰道亦是放置月經杯或棉條的位置。

陰道冠（處女膜 ）

位於陰道口的膜狀組織，中間有孔而不完全封閉。劇烈運動、性行為、醫療檢查等活動對處女膜會否破裂的影響亦因人而異。

月經杯

是可循環使用的月事用品，原理為放入陰道內收集經血。月經杯多數由醫療級矽膠製造，保養得宜的話可以使用數年。

經前綜合症 

泛指於月經來潮前出現的一系列癥狀，如背痛、暗瘡、疲倦、情緒不穩、便秘、肚瀉等。

月經假

指來經者因月事不適，而選擇申報的有薪或無薪假(而非列入病假)。目前香港沒有就月事假立法。

月經者

月經者是指所有會來月經的人。

月經貧窮

指因經濟困難而引致與月經相關的多種問題，如缺乏適切而衛生的月事用品、減少更換月事用品的次數、衍生與月經相關的健康問題、造成社交困擾等。

世界月經日

定於每年的五月二十八日，旨在點出良好月事衛生的重要性。這日子亦代表著女性平均來經日數(五天)和平均月經週期(二十八天) 。

Menstruation

Menstruation is a natural monthly process of the uterus shedding its lining when no pregnancy occurs. The average cycle is every 28 days, lasting for 3-5 days.

Cervix

Cervix locates at the lower part of the uterus, connecting to the vagina. During menstruation, the cervix would be firmer and in a lower position than non-menstrual period.

Vagina

Vagina is the elastic muscular part of the female genital that serves as the channel of menstrual blood, childbirth, and penetrative sex. Vagina is also where menstrual cups or tampons are placed.

Hymen

The hymen is a membrane at the vaginal opening, which naturally contains holes instead of fully closed. It may or may not tear under circumstances of exercise, sexual activities and medical examination etc. depending on individual physique.

Menstrual cup

Menstrual cup is a menstrual product that functions by collecting menstrual blood while placed in the vagina. They are usually made of medical grade silicone and could be reused for years when properly cleaned and handled.

Premenstrual syndrome (PMS)

Premenstrual syndrome refers to a variety of symptoms menstruators may experience before their menstruation. Examples include back pain, acnes, tiredness, mood swings, constipation or diarrhoea etc.

Menstrual Leave

Menstrual leave is a type of paid or unpaid leave where menstruator may opt for when needed. There is currently no legal policy dealing with menstrual leave in Hong Kong.

Menstruators

Menstruators refers to anyone who menstruates regardless of gender.

Period Poverty

Period poverty refers to scarcity of menstrual products due to financial factors, leading to problems such as limited frequency on changing for clean menstrual products, lacking hygienic menstrual products, and subsequent health and social impacts.

Menstrual Hygiene Day (MHD)

MHD is an annual awareness day every May 28 to highlight the importance of good menstrual hygiene. The date is to represent the average menstrual duration of 5 days (hence May) and menstrual cycle of 28 days.