Hoe did narrator conclude that he had a liver aligment

The narrator was certain he had a liver ailment because he had every symptom listed on the liver-pill brochure he'd been reading.

"I knew it was my liver that was out of order, because I had just been reading a patent liver-pill circular, in which were detailed the various symptoms by which a man could tell when his liver was out of order."

sir, please can you give answer in brief because if question comes in 5 marks so..