The three major medical facilities are the Kodaikanal Health and Medical Services (KHMS), Van Allen Hospital and the Government Hospital. These hospitals treat patients with common ailments and injuries and perform child delivery and care, but are not equipped with modern medical equipment for complicated diagnoses and surgeries.

KHMS is a modern hospital and is well-suited for the basic needs of the people, including child delivery. The local residents and those from the nearby villages, do not have to travel down to the plains, thanks to KHMS. KHMS is an integrated hospital, wherein both modern medicine as well as other forms of medicine are practised, this includes, homeopathy,reflexology, reiki, cold pack treatment, spinal bath, naturopathy, murma (diagnosis through the pulse). KHMS offers x-ray (radiology); sonography (ultrasound); pathology laboratory, pharmacy, OT, OPD. KHMS has a modern dental clinic as well.

In April 1915, Dr. Van Allen raised funds to construct the first unit of the hospital at the entrance of Coaker's walk. It was named after him. Facilities got updated from time to time and now it has X-ray machine, well equipped pathological lab, and operation theatre with blood transfusion facilities.

Government Hospital is situated on the hillside near Rock cottage on lower shola road. It was a small municipal hospital until 1927. Now it has X-ray, Dental, Maternity ward and other facilities.

Air and water-borne mercury emissions have contaminated large areas of Kodaikanal and surrounding forests. A study conducted by the Department of Atomic Energy confirmed that Kodaikanal Lake has been contaminated by mercury emissions.,

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