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).Angarakan (Mars) was one of the Navagraha in 9 planets. One day, he suffered a lot from Skin diseases (Leprosy). He prayed Lord Vaidyanatha Swamy in Vaitheeswaran Koil. Lord Shiva blessed him and cured his diseases. So he stayed in this temple and called as “Vaitheewaran” and cure all the diseases by whom praying him.