Through the 1860s, the health of the Emperor steadily worsened. It had been damaged by his six years in prison at Ham; he had chronic pains in his legs and feet, particularly when it was cold, and as a result, he always lived and worked in overheated rooms and offices. He smoked heavily. He distrusted doctors, disregarded medical advice and attributed any problems simply to "rheumatism", for which he regularly visited the hot springs at Vichy and other spas. It became difficult for him to ride a horse, and he was obliged to walk slowly, often with a cane. From 1869 onwards, the crises of his urinary tract were treated with opium, which made him seem lethargic and apathetic. His writing became hard to read and his voice weak. In the spring of 1870, he was visited by an old friend from England, Lord Malmesbury. Malmesbury found him to be "terribly changed and very ill".