A motor nerve palsy does not usually cause eye pain in patients. The main effects of motor nerve palsy are the involvement of the motor nerve and the muscles around the eye. Patients may experience ptosis, outward and downward strabismus, inability to rotate upward, inward and downward, diplopia, dilated pupils, and disappearance of the light reflex and accommodation reflex, etc., which usually do not cause eye pain. However, if the patient has a concurrent eye infection, eye pain, congestion, increased secretion and other discomforts may occur. The common causes of motor nerve palsy are brainstem diseases, inflammatory diseases such as encephalitis and meningitis, tumor diseases such as skull base tumors, and myasthenia gravis, etc., which also usually do not cause eye pain. It is recommended that patients with motor nerve palsy seek medical attention to evaluate their condition and follow the doctor’s instructions for treatment.