(CNN) A trip to a tourist attraction in Scotland turned out to be a life-changing moment for one woman after a thermal camera detected she had breast cancer.

Bal Gill, 41, was looking back over images from her trip to Camera Obscura and World of Illusions, in Edinburgh, when she noticed a heat patch over her breast.

After making an appointment with her doctor, Gill was diagnosed with early stage breast cancer -- but experts have warned that Gill was lucky and thermal imaging cameras are not effective in screening for the disease.

Gill, who visited the attraction in May, wrote to Camera Obscura following her diagnosis, telling staff she had searched Google for information about what the hot spot could mean and saw articles about breast cancer and thermal imaging cameras.

"I have now had two surgeries and have one to go to prevent it from spreading," she wrote in a letter published on the Camera Obscura website

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