A 31-year-old man told police he had attacked his 63-year-old mother at their home in Hing Wah (I) Estate, Chai Wan, at about 6pm on 12 November.
Police said officers found the woman with injuries to her head, neck and hands. She was conscious when taken to hospital, where she was treated. Officers recovered two kitchen knives, and the man was arrested on suspicion of wounding and detained for investigation.
She was later admitted to intensive care and remained under observation.