The Siddha medicine (Tamil: சித்த மருத்துவம், (Citta maruttuva) is one of the oldest medical systems known to mankind. This system of medicine originated from south Indian Tamil traditional medicine, as part of the trio Indian medicines - ayurveda, siddha and unani. This system was very popular in ancient India. Believed to be more than 5,000 years old, the Siddha system of medicine is considered to be one of the most antiquated traditional medical systems.
The system is believed to be developed by the 18 siddhas of the south populars called the Siddhars. Siddhars were spiritual adepts who possessed the ashta siddhis, or the eight supernatural powers. Sage Agathiyar is considered the guru of all Sidhars, and the Siddha system is believed to have been handed over to him by Lord Muruga, son of the Hindu God - Lord Shiva and Goddess Parvathi. So, are the siddhars the followers of Lord Shiva (Shaivaites). Agathiyar is the first Siddhar, and his 18 disciples contributed thousands of texts on Siddha, including medicine, and form the propounders of the system in this world. We will be seeing the Siddars in deep as time comes,,,,,,