Hi, 
Welcome to HealthCareMagic.com I am Dr.J.Mariano Anto Bruno Mascarenhas. I have gone through your query with diligence and would like you to know that I am here to help you.
Masturbation does not cause Carpal Tunnel Syndrome
Keyboard use can cause it 
Masturbation is Physiological 
It means it is a normal phenomenon 
It does not cause any problems 
It does not have any side effects 
It does not interfere with your general Health 
It does not interfere with your Sex Life 
There is no need to Stop it 
And
There is no need to worry about this
Please do not believe non medical articles or rumours 
Hope you found the answer helpful.
If you need any clarification / have doubts / have additional questions / have follow up questions, then please do not hesitate in asking again. I will be happy to answer your questions.
 In the future, for continuity of care, I encourage you to contact me directly in HealthCareMagic at http://bit.ly/askdrbruno 
Best Wishes for Speedy Recovery 
Let me know if I can assist you further.
Take care.