 [ Symptoms ] is using a mouse causing muscle knots and now numbness and tingling in my right arm specifically around bicep  i work from home and am on the computer typically 7 8 hours most recently i have been experiencing muscle knots in my upper shoulder and am now having numbness and tingling in my upper arm specifically in the area of my bicep i work out regularly do not smoke and drink socially i eat relatively healthy and was wondering if the use of the mouse is causing this [ Disease ] there are a number of reasons stool may change such as due to an infection virus change in medication etc it is good that you are seeing a medical professional about this concern so you are able to get a proper diagnosis and treatment here is an overview on stool analysis that may help you learn more about your situation i hope this helps the webmd answers staff