"I quietly paid for my shopping and left before anyone noticed the tears."
The letter was published on a Facebook event page which the woman set up to organise a "Boobymob" at the supermarket in February: a flashmob to raise awareness about the importance of women checking for lumps and changes in their breasts.
The "Saffron Walden Boobiebellion" page has now attracted over 5,000 likes. One supporter called the organiser a "survivor and warrior", and another said: "I wish you all the luck in the world, you are incredibly brave and I salute you and your wonderful Boobie hat."
A Twitter account has also been set up to coordinate activity: @boobiebellion.
Users of Facebook and Twitter have been sharing fun boob-related photos in support, including "boobycakes" - cupcakes with icing nipples - and a "booby bouquet".
Bondara, a UK-based sex toy retailer posted a photo of staff wearing their "booby beanies" which are normally sold as joke headgear for hen parties, and pledged to donate all profits from the hats to the charity Breakthrough Breast Cancer.
The "Boobymob" is currently planned to take place on 14th February, at Tesco in Saffron Walden. The duty manager of the store said: "Even though this is taking place on Tesco grounds, as it is a publicly organised event we will not be commenting on it at this time."
-Independent