If you take any medication, ask your doctor can you do tattoo. Aspirin should not drink before tattooing, you should not drink alcohol. Get some sleep well before tattooing and eat a big meal. If you suffer from epilepsy, diabetes, hemophilia or any similar illness consult your doctor before doing tattoo.
There are medical tattoos, which are placed from natural medical reasons so diabetics or people suffering from certain serious diseases can tattoo a tattoo that shows their disease what is important in emergency so thy will warn health workers on that way.