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With so much variation in how many women experience their monthly cycle, it's difficult for a woman to know what is 'normal' and what they should flag with the doctor.
So to help answer some common questions, FEMAIL spoke to Australian general practitioner and owner of Sapphire Family Medical Practice in Bondi Junction, Dr Dasha Fielder.
Point - Women - Menstruation - Cycles
'The most important point to make is that women's menstruation cycles can vary significantly, which is completely normal,' she said.
'There is a lot of inaccurate information provided by alternative health practitioners that creates anxiety in women and results in unnecessary tests and treatments that have no evidence behind them.'
Dr - Fielder - Cycle - Days - Period
Dr Fielder said that a normal cycle is anywhere between 26 to 35 days with a period that lasts from three to seven days.
Periods normally start with brown discharge and mild cramps and proceed to heavier bleeding for two to three days with stronger cramps.
Then after this the blood becomes lighter before eventually concluding.
'How women respond to hormonal fluctuations and pain is greatly variable but not in itself abnormal,' she said.
Oestrogen - Sex - Hormone - Development - Regulation
Oestrogen is the primary female sex hormone that is responsible for the development and regulation of the female reproductive system, which Dr Fielder said peaks mid cycle.
Then as the days go on progesterone, another sex hormone involved in the menstrual cycle, begins to rise and oestrogen begins to drop.
Women - Oestrogen - Side - Effects - Mood
'In general some women can respond to dropping oestrogen with negative side effects such as mood variations, anger and insomnia,' she said.
'Progesterone rising can make some women bloated, constipated and prone to water retention.
Women - Something - Investigating
'However it is important to note that this is completely normal and should not be presented to women as something that needs changing and investigating.'
Dr Fielder said oestrogen and progesterone are important hormones for women that controls their reproductive cycle and their main function...
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