Which makes me suspect that it could be down to
stress. Also, On a daily basis, I am constantly using the computer or
laptop, and have been known to spend hours at a time concentrating. My doctor ran tests and found nothing irregular about by blood pressure, co-ordination or heart rate. Are these symptoms most likely caused by stress/anxiety, or could there be something more serious such as a brain tumor? I am male, 5ft 3 inches, 119 Pounds and 16 years of age.