The incident happened in York Road last Wednesday night (November 29).
Police taped off a house in the street after attending the scene at around 8pm. The ambulance service also attended.
Police were still there the next morning (Thursday, November 30).
“Officers attended and the victim, a woman in her 70s, was taken to hospital by the ambulance service with significant, but not life-threatening, injuries.
“A 52-year-old man from Bexhill was arrested on suspicion of causing grievous bodily harm with intent and has been detained under the Mental Health Act. An investigation is ongoing to establish the full circumstances.”