Some of them were injured as a result of clashes between pro-democracy protesters and yellow-shirt royalists.
The centre said that of the 55 injuries, 32 people had been hurt by tear gas, six were shot, four took sick and 13 had other symptoms.
“Thirty-seven people were sent to Vajira Hospital, five to Phramongkutklao Hospital, four to Praram 9 Hospital, and one each to Rajavithi Hospital, Phetcharavej Hospital, Klang Hospital, Lerdsin Hospital and Mission Hospital,” the centre said.
Ratsadon group protesters had gathered outside Parliament on Tuesday to pressure lawmakers to accept the iLaw constitution amendment draft, which aims to reform the monarchy and have it come under the purview of the Constitution.
However, the clash emerged after riot police used tear gas and water cannons to prevent protesters breaking through to Parliament. The demonstrators also reportedly threw a flare and a firecracker at police. Protest leader Arnon Nampa decided to call off the protest at 9pm, and asked demonstrators to gather at Ratchaprasong Intersection at 4pm on Wednesday.