Aromatherapy can't cause any pain or discomfort. Aromatherapy is the practice of using plant oils for psychological and physical well-being.
The massage part can cause you pain and discomfort, depending on your muscles and the practitioner. The deeper the work, the more pain you may experience. Practitioners tell you to drink a lot of water after to reduce soreness.
I always hurt for days after a massage no matter how much water I drink so I never get them.