The number of women who suffer from endometriosis is estimated to be around one in 10, with under-diagnosis a severe issue impacting on appropriate treatment.
In fact, according to Endometriosis Australia the average wait time for diagnosis is between seven and 10 years, with the disease impacting on all aspects of womens' lives.
While there has been funding promised to endometriosis research, there remains an issue with women not chasing up other abnormal period symptoms - and frankly, putting up with unnecessary pain, nausea and other crippling side effects.
The Hit Newsroom spoke to Dr Yasmin Tan from the Women's Health & Research Institute of Australia to debunk some mysteries about periods, and work out for you exactly what is normal and when you should seek professional help.
Dr Tan is a gynaecologist, laparoscopic surgeon and ultrasound specialist, and lectures at the University of NSW and University of Notre Dame.
Listen to Dr Tan's full answer below.
"I would say that it would be worth seeking medical advice if your periods are painful enough that you are having to take a lot of pain relief during your period," she said.
"But if the periods are limiting them from doing any specific activity or work then that probably needs to be looked into further."
Dr Tan also spoke about the heaviness that is 'reasonable' for a normal period and when it would require medical intervention. You can listen to her answer above.