Kate tweeted in response to a twitter statement from US singer Halsey, who is currently recovering from "multiple surgeries" as a result of the illness.
Kate added to her tweet: "I suffer from this it's not easy."
Endometriosis is a condition where tissue that behaves like the lining of the womb (the endometrium) is found outside the womb. The condition is estimated to affect around 2 million women in the UK.
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