The big picture: Officers were called to an address in Mottram Close in the Pinewood area of Ipswich just before 9:30pm on Sunday after receiving concerns from a member of the public. They discovered the woman's body inside the property.
The death is currently being treated as suspicious but unexplained.
A Home Office post-mortem examination is scheduled for Monday.
The arrested man remains in custody for questioning at Martlesham Police Investigation Centre.
What they're saying: Detective Superintendent Nicola Wallace said: "We understand that this incident may cause concern locally. However, officers are treating this as an isolated incident and both the deceased and suspect were known to each other."
Wallace added: "In cases where we have a death that is unexplained and gives us sufficient cause for concern, it is vitally important that we follow all due procedure and fully investigate the circumstances."
Why it matters: While the incident may raise concerns among residents, police are emphasising it appears to be isolated, with the deceased and suspect known to each other.
What's next: Police are appealing for anyone with information that could assist the investigation to contact South CID at Landmark House, quoting reference 37/48482/24.
People can provide information via the Suffolk Police website or by calling 101.
Alternatively, they can contact Crimestoppers anonymously on 0800 555 111 or through their online form.
