Are there any diseases you can get from masturbating?

Shouldn't be! Unless you are using some more "unorthodox" method of masturbation, you should not fear a disease. If you are sharing materials, or have contact with contaminated materials or if you have a "hand" infections, then there should be not worry for "disease". Keep it simple, clean and safe. If you have questions otherwise, re-submit or ask your doctor about your personal practices for advice.