It can deplete your energy and make you sleepy/tired, but not physically hurt you.
The problem comes if you masturbate all the time and never get out to meet new people and develop other engaging relationships.
If you're spending all your time self-stimulating yourself, then you've not getting out there and living!
Information on this site is provided for informational purposes only.
It is not meant to substitute for medical advice provided by your physician or other medical professional.
If you have or suspect that you have a medical problem, promptly contact your physician or health care provider.