Now a days data is very essential for every company, organization, business and even for any newly startup. Data helps to all to take important decisions related to their growth. When the size of data is increases beyond the limit.When it becomes so large that it is very difficult to manage by the traditional database software. Then we called it Big Data. Big Data deals with unique computational, scalability, storage and processing challenges. Big Data manage the huge amount of data, store it and further process that data in a very efficient manner. So that a valuable information can be retrieved from that huge data to take any decision. Even then many organizations are not using Big Data because there are some issues and challenges which have to be addresses. In this paper, we discussed major available issues and challenges in Big Data. We also discussed some methods to deal with them.