Chief Constable Gary Roberts says one in five incidents police are called to involve people with mental health issues.
He was giving evidence to Tynwald's Social Affairs Policy Review committee on Friday when he made the claim.
Mr Roberts was asked whether the number of such incidents had fallen after police began working with other agencies.
He said so far there'd been no change, although he did expect the figure to fall in future:
Onchan Park reopening this weekend
Onchan Pleasure Park is reopening for Easter this weekend!
Wetherspoons opening date confirmed
The Island's new Wetherspoons will be open before TT, according to bosses.
Busy Douglas road to shut again after October work
Roadworks in Douglas will mean traffic restrictions on Victoria Road for the second time in six months.
Castletown Golf Links Hotel sold
A well-known hotel on the Langness peninsula has been sold.
Manx Care hit with data enforcement notice by commissioner
Manx Care's been rapped for dragging its heels under data protection laws.
Castletown restaurant under new management
The team behind the Sound Cafe, Bradda Glen and the Aqua Café at the NSC will be taking over a restaurant in Castletown.
Beware of wildfires in sunny weather!
The Island's Fire and Rescue Service wants you to get outside and enjoy the warmer weather, but to be aware of the risks that can cause wildfires.
Staff training means GP closures
Manx Care say GP practices will close for three afternoons in April.
