For the last couple years there has been recent controversy on whether or not cell phones have a negative effect to there body. Well, cell phones do harm the body eventually maybe even causing cancer. Cell phones emit radio frequency energy, which can be absorbed by the tissues closet to where you have you phone. This means if you have your phone held to your ear most of the time, your more likely to have cancer in that area, or any other health problems. Some common problems that cell phones could cause are, increasing heart rate, increasing blood pressure, for men they will have a problem with DNA, low sperm motility  low viability, low morphology, and increased OS. (http://www.precisionnutrition.com/all-about-cell-phones-health). Other symptoms include fatigue, burning near ear, headache, numbness, tingling, and low concentration. We all tend to thing that cell phones are harmless, but they are now where close as you can see. Cell phones have also been linked to sleep and immunity. Some cell phone users have reported that they are more fatigue and have more headaches, however its not clear whether these are connected to other things or activities such as overworking, or constantly focusing the eyes to see the text screen, or even the brightness of the screen. According to Ryan Andrews, "Scientists speculate that cell phones might harm our bodies in a couple of ways:

• Thermal: Radiation can elevate body temperature (think: microwave oven). With a cell phone in our pocket or by our head, slight temperature increases might disrupt cellular functioning. The eyes and testes appear especially susceptible.
• Non-thermal: Radiofrequency energy can alter cell membrane permeability, the movement of calcium ions, cell excitability, free radical production, blood-brain barrier integrity, the stress response and/or neurotransmitter release.

What does this mean? Well it means we have to be way more careful of how we use our cell phones and how much we should use or cell phones.