Endometriosis affects 1 in 10 women and is an incredibly debilitating illness that can cause many further conditions. I personally suffer from endometriosis but, as it is not recognised as a disability, struggle with work/school. Have endometriosis regonised as a disability under the Equality Act.
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Endometriosis affects a large amount of women, putting them in near constant pain and causing extreme fatigue, amongst other symptoms.
References:
General Information about Endometriosis: https://www.uclh.nhs.uk/OURSERVICES/SERVICEA-Z/WH/GYNAE/ENDOM/Pages/Generalinformationabout.aspx
The NHS page on the illness:
https://www.nhs.uk/conditions/endometriosis/
Endometriosis UK:
https://www.endometriosis-uk.org/