In India, the left side of the nose is generally regarded as the ideal position for nose rings. According to the Ayurvedic belief the spot made by piercing the nostrilĀ is associated with the female reproductive organs. It is generally believed that woman who have there nose pierced on the left side experience less pain while delivering the child and less menstrual pain.
According to Indian traditions and culture, nose ring is considered as one of the signs of marriage, and is an integral part of traditional bridal jewellery. PiercingĀ the nose is considered as a way of honoring Parvathi, the Hindu Goddess of marriage.
(Source: iamzaaz)