The word Indian is for people from the country of India. The word indigenous is used to describe native peoples of the land who lived there before the arrival of colonizers.
However, some people use "Indian" for indigenous people. It is not correct, but people do it anyway - this is because the earliest European colonizers of the Americas mistakenly called the native people "Indians."
Members of the indigenous peoples of the United States can be called Native Americans.
You can read more about the history of names for native peoples here: http://en.wikipedia.org/wiki/Native American name controversy
Radishes are considered roughage, which means that it is composed of indigestible carbohydrates. This facilitates digestion, water retention, and it fixes constipation, which is one of the major causes of piles. As such a good detoxifier, it helpsheal the symptoms of pilesvery quickly. Its juice also soothes the digestive and excretory system, further relieving the symptoms of piles.