We present the case of a 48-year-old woman with hypothenar hammer syndrome. Hypothenar hammer syndrome is caused by chronic repetitive trauma to the ulnar artery and superficial palmar arch. This syndrome was originally described in males working in occupations that involved repetitive blunt trauma including working with jackhammers. It is believed that the ulnar artery is repetitively damaged by blunt compression against the hamate. Our patient was a postal worker who frequently used a rubber stamper.