 [ Symptoms ] rotator cuff injury i believe that is what i have i have been suffering from left shoulder pain for a while and it is gotten to the point that if i move my arm a certain way it feels like a knife is going through it i cannot lie on it but for a few minuets and then im in pain i can move my arm forward with very limited pain but any other direction i cannot without sever pain does this sound like a rotator cuff tear [ Disease ] hi this can happen if you were heading for periods in 2 days it may also occur due to hormonal changes in your body causing the vaginal internal mucosal lining to be more fragile sometimes rough sex can cause this u should have more of foreplay before sex to assure good lubrication during sex thanks