With many books incorporating different urology practices and observations and nearly 30 works in the Hippocratic book collection entitled "Aphorism" seemingly solely dedicated to urology in general, urology was one subject that was thoroughly investigated. Seemingly, the main and most problematic topic covered in urology was that of bladder disease in patients, especially when urinary tract stones (that is, stones within either the kidneys or the bladder) were present. Urinary tract stones, in general, have been seen within records all throughout history, even as far back as the ancient days of Egypt. Theorizing how these urinary tract stones formed, how to detect them and other bladder issues, and the controversy on how to treat them were all major investigating points to the authors of the Hippocratic Corpus.