Do you have more pronounced pain bending over and going Up & Downstairs? If so, you may have sinus pain which feels like tooth pain.
Many years ago, I had an upper molar case that I felt was not a tooth but a sinus problem. The patient saw me 3 times and I didn't do the root canal she requested. She returned for a 4th visit saying her Ear, Nose, and Throat doctor said her pain was not a sinus problem. I accessed her molar root canal and found it bleeding moderately (healthy pulp) and finished the job. She returned a few days later stating she is having the exact same pain. She went to another Ear, Nose, & Throat doctor who ordered images and sure enough, it was a sinus problem.