What are the negative effect of electromagnetic waves on human brains from smartphone influenceScientists proved that the smartphone is a source of the eminence of electromagnetic waves. Numerous studies have been conducted in the past years to identify the effect of electromagnetic waves emitted from the cell phones on human health.However, it has not proved smartphone can influence our health certainly. As soon as mobile phones more and more part of our lives, the world is continuing research to prove whether cell phones are harmful to human health. Today, there is no official statement announced by laboratory or medical center to answer this question: The complexity of the analysis of the statistical data makes the task more difficult for researchers. The impact of harmful radiation emitted from cell phones is still being studies.Nowadays, human are accepted to use mobile phone in any time, any where popularly. Although, mobile is a good small size and convenient carrying of communication tool for human to use when we need to make phone calls to anyone in anywhere and any time conveniently. But, I feel that it will harm human health when we often use this communication tool any time.However, some doctors indicate cell phones can cause brain cancer risk easily. But they have not any evidences to prove it is truth nowadays. Hence, the statement that cell phones can cause cancer has been not confirmed. The studies failed to prove that cellphones make a major risk develop cancer among frequent users. The main issues when conducting studies are some people may not accurately report the usage as they don't exactly remember how often they use the cell phone excluding speaker phone, and it is still difficult to measure the impact of other factors that may accelerate the cancer development for excessive cell phone users.Although, it is not proved that cellphone can use brain cancer to human when we often use. But some scientists or medical professionals have proved that the cell phone users often use cell phones, it is possible to cause human physical illnesses, such as upper extremities, back and neck caused unhealthy and pain.A smartphone or handhelds device combines advanced computing capability, such as internet communication, information retrieval, video, e-commerce and other features, that make device highly popular among people. According to Pew research center investigating, it showed that the number of smartphone owners comprises 56% of American adults in 2013 year and their average daily use of the device is about 195 minutes. The number of cellphone users increase every year. Various studies show the connection between cellphones usage and physical illness of the users' health. Some studies report that users complain about a headache, hand tremor and finger discomfort and pain of physical illnesses numbers increasing.In fact, most mobile hand-held device users complain of discomfort at least on one area of upper extremities, back or neck. Long -term usage of the device leads to additional tension on tenders, muscles and tissue etc. different kind of physical illnesses. Moreover, in research conducted by a group of Korean scientists from Inji University focused that an effect of cellphone on hand-held device users was a significant association between the total time spend using a mobile device each day and pain in the right shoulder, and between times spend internet browsing and pain at the base of the right thumb.