Conversely, a painful feeling is when a part of the body constantly hurts. No matter where you have tendonitis, you might experience a painful sensation in the area. In making a diagnosis, a doctor might use the pain scale to discover how severe it is. This scale goes from 0 to 10 with zero being no painful feeling and 10 being that it's so painful you feel like passing out. Most painful sensations associated with an inflamed tendon fall between 1 and 7. This includes occasional minor twinges up to difficulty concentrating, interference with sleep and being able to function only through effort.Next