Fire broke out in the terrace of a private hospital in Chromepet on Thursday.
No one was injured, but a room containing discarded goods was nearly destroyed.
Police said the fire broke out at 2 p.m. in the building housing Sree Balaji Medical College Hospital. Two fire tenders reached the spot and put out the fire.
Several patients undergoing treatment were evacuated immediately.
Firemen said the cause of the fire was being investigated.