Ask whether the therapist is trained in a particular type of massage.
Tell the therapist about any conditions or injuries that you have
Ask ahead the number of treatments that might be needed and the cost.
Ask whether the therapist is licensed or certified to practice in your state.

Opt for a massage over seeking medical advice.
Get a vigorous massage if you have a bleeding disorder or are taking a blood thinner such as warfarin.
Allow the therapist to massage on area with an open or healing wound, blood clot, or fracture.
Choose massage without consulting your doctor if you are pregnant or have cancer, diabetes, high blood pressure, or osteoporosis.
Continue massage if you experience serious pain, numbness, or tingling, or feel unwell during a session. Stop immediately.
Source: Consumer Reports on Health September 2012