Uncle Tom's Cabin by Harriet Beecher Stowe

Two days after this, Alfred St. Clare and Augustine parted; and Eva, who had been stimulated, by the society of her young cousin, to exertions beyond her strength, began to fail rapidly. St. Clare was at last willing to call in medical advice -- a thing from which he had always shrunk, because it was the admission of an unwelcome truth.

But, for a day or two, Eva was so unwell as to be confined to the house; and the doctor was called.