horner's syndrome causes
Horner's syndrome usually is caused by some kind of damage to a string of nerves that help control your eyes, heart rate, sweat, and blood pressure. Neck or shoulder injuries during delivery can cause Horner's syndrome in some babies, but it's very rare. Babies born with damage to their aorta can also have it.
What causes Horner's Syndrome? If the sympathetic nervous system that supplies the eyes is damaged or is malfunctioning, the parasympathetic system 'takes over', and the symptoms of Horner's Syndrome appear. The damage or malfunction can occur in the neck area, the ear area or the eye area.
Horner's syndrome causes problems on one side of your face when the nerves there are damaged. It can have many different symptoms, such as small pupils or droopy eyelids. It's also called Horner-Bernard syndrome or oculosympathetic palsy. You can get Horner's syndrome at any age, and both men and women get it.