"needed treatment" is correct and usable in written English.
You can use it whenever you are talking about something needing medical attention. For example: "The patient needed treatment for the virus."
Hazard, though, needed treatment.
His son's spina bifida needed treatment.
'Others told us that every criminal needed treatment, not punishment.
Several Spurs fans needed treatment at a hospital.
Sir Alex Ferguson was furious, De Gea needed treatment.
Only 12percentt of H.I.V.-positive pregnant women were assessed for whether they needed treatment themselves.
Matt [Sorum] really thought I was sick; he thought I needed treatment for sex addiction.
He needed treatment from the club's doctor but quickly resumed his place.
Some 1,500 people had to be evacuated, though only four needed treatment for smoke inhalation.
It was a disease that needed treatment as much as any other disease did.
José Carlos Bauer brought down Bozsik, who needed treatment and came back infuriated.
