Vaitheeswaran Koil is a Hindu temple dedicated to the Shiva, located in the Indian state of Tamil Nadu.Shiva is worshipped as Vaidyanathar or Vaitheeswaran meaning the "God of healing" and it is believed that prayers to Vaitheeswaran can cure diseases. Vaitheeswaran is a Tamil derivative from vaidya (Doctor) and Ishvara (God/Master). The presiding deity is Sri vaidyanathan, facing towards West whereas East side is the common one. He is the God of Healing. When pronouncing in Tamil, it sounds like "vaideeswaran". It is one of the nine Navagraha (nine planets) temples and is associated with the planet Mars (Angaraka).

Vaitheeswaran Koil, located in Tamil Nadu, is a renowned temple dedicated to Lord Shiva in his form as Vaidyanatha, the divine healer. The name "Vaitheeswaran" translates to "God of Healing," and the temple holds immense significance for those seeking relief from ailments and spiritual guidance. Devotees believe that the sacred waters of the temple’s Siddhamrita Theertham have miraculous healing properties, and rituals performed here are said to cure physical and spiritual ailments, offering solace to countless pilgrims.

Vaitheeswaran Koil is not only famous for its spiritual healing but also as the birthplace of the revered Naadi Astrology. It is here that ancient Tamil sages, including Maharishi Agasthiyar, inscribed the divine scripts of Naadi on palm leaves. These manuscripts contain the life stories of individuals, meant to be discovered by those destined to seek them.