Please let me know what is the common affliction to a man's left eyelid drooping or becoming lazy?

Ptosis of lid. You have described a drooping of the eyelid, termed ptosis. This can come from neuro-muscular disorders, neurologic disorders like Horner's syndrome, growths in the eyelid and in the space above the eye, some vascular disorders as well. If this is of recent onset, it needs ophthalmological evaluation to determine the cause and prevent more serious problems.