In 1839, during a visit to Continental Europe, Martineau was diagnosed with a uterine tumour. She several times visited her brother-in-law, Thomas Michael Greenhow, who was a celebrated doctor in Newcastle upon Tyne, to try to alleviate her symptoms. On the last occasion she stayed for six months in the Greenhow family house at 28 Eldon Square. Immobile and confined to a couch, she was cared for by her mother until purchasing a house and hiring a nurse to aid her.