A young boy named Theo Lock, aged four, was found to have a rare stage four cancer after repeatedly experiencing severe leg pain that was initially misdiagnosed as constipation or arthritis. Theo began suffering from intense leg pain shortly after starting primary school, which eventually made it difficult for him to walk properly.
His mother, Jess Horne, took him to the hospital multiple times seeking answers. Initially, medical professionals suspected constipation or arthritis, but further investigations, including an x-ray, revealed a possible cyst in his hip and later a mass near his kidney. Subsequently, in March, Theo was diagnosed with stage four neuroblastoma, shocking his family.
Following the diagnosis, Theo was moved to Royal Manchester Children’s Hospital for aggressive chemotherapy treatment. The excruciating pain in his legs caused him to cry while attempting to stand, as reported by his aunt, Poppy Lock.
Neuroblastoma is a rare cancer affecting children’s nerve tissue, with approximately 100 cases reported annually in the UK among children under 14. Symptoms include abdominal, neck, or chest lumps, swollen lymph nodes, bone pain, and dark circles around the eyes.
Poppy described Theo as a cheerful boy who loves superhero characters like Spiderman and Black Panther before the chemotherapy took a toll on his body, leaving him mostly bedridden. To support Theo and his family during this challenging time, Poppy initiated a successful GoFundMe campaign that has raised over £23,000.
Expressing gratitude for the overwhelming support, Poppy hopes the fundraiser will not only assist Theo’s family financially but also raise awareness about neuroblastoma. She emphasized the importance of persistence in seeking medical attention for unusual symptoms, especially in cases of rare cancers like Theo’s.

