Wendy, some info :
Pancoast tumours
Doctors sometimes call lung cancer that is growing right at the top of the lung a 'pancoast tumour'. These tumours can cause very specific symptoms. The most common is severe shoulder pain. They can also cause a collection of symptoms called 'Horner's syndrome'. These are
Drooping or weakness of one eyelid
Small pupil in that eye
Loss of sweating on that same side of the face
These symptoms of Horner's syndrome are caused by the tumour pressing on or damaging a nerve that runs up from the neck to that side of the face.
You noticed several of us had Pancoast tumors, tumors up in the apex of our lungs, where blood vessels and nerves are present. These can cause symtoms. Most all of us have at least the shoulder pain in common. I personally did not ever notice an eye problem, drooping.
Donna G