NEW DELHI — Doctors in northern India have surgically removed 40 knives from the stomach of a man who had swallowed them over the past two months, one of the physicians said Tuesday.

The 42-year-old man, identified as Surjeet Singh, is recovering in a hospital in Punjab state after undergoing surgery Friday in which doctors removed the knives – some folded and some with exposed blades up to 7 inches long.

Dr. Jatinder Malhotra, who assisted during the five-hour operation, said Singh, who works as a police constable, was apparently suffering from a psychiatric disorder and is now being counseled.

Malhotra said he had never before heard of a case of a person swallowing knives.

“In my 20-year career, and in all the medical literature that we checked, there has never been a case like this one, where a person has swallowed not one, but 40 knives,” said Malhotra, a critical care doctor at the Corporate Hospital in the city of Amritsar.

Singh told doctors that he could not explain his urge to swallow knives. “He told us he would swallow the knives along with a glass of water,” Malhotra said. “He had no explanation for why he did it. Just an urge.”

Singh had come to the hospital two weeks ago complaining of severe pain in his abdomen.

“In an endoscopy, we saw a big mass in his abdominal area,” Malhotra said by phone. “We initially thought it was a tumor or some cancerous growth. But it was like nothing we doctors had seen before.”

A team of two surgeons, two critical care physicians and an anesthetist conducted the surgery, during which they initially removed 28 knives. But further investigation revealed 12 more, the hospital said.

There was massive internal bleeding during the surgery because the knives, which were all made of iron, had lacerated the man’s stomach walls, Malhotra said.

Since the surgery, the man has told doctors that he can’t bear to look at another knife. “He even asked his wife to get out of the room when she was cutting some fruit for him,” Malhotra said.

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