It’s best not diagnose but to refer your client to seek professional advice.
I currently train a client that had her torn hip labrum repaired. Before she had her surgery, she was/is an active tennis player and certain movements on the courst and in the gym, really caused her pain.
I suggested her to see a physician to diagnose her pain that resulted in surgery for the repair.
She has resumed our Personal Training with written permission from her physician/physical therapist. Now on the road to recovery, she will soon be back on the court.