 THI was founded by Dr. Regi George and Dr. Lalitha Regi in 1993 to provide quality healthcare at an affordable rate to the tribal population of Sittilingi village in rural Tamil Nadu with just with just one Outpatient unit (OP).As of 2010 it had grown to include a 24-bed hospital with a labour room, neonatal unit, operation theatre, diagnostic laboratory and imaging facilities, a community health outreach programme, an organic farming initiative and a craft initiative which aims to revive traditional Lambadi embroidery.As of 2018, THI is a full-fledged hospital with six doctors and 30 nurses attending to close to one lakh patients every year.