The answer to your question 'why does my eye twitch?' can be for many different reasons. The technical name for eye twitching is Blepharospasm and it is caused by muscle spasms in the eye lid and around the eye. It is believed to be related to the nervous system. It tends to start suddenly and can last for anything from a few hours up to a few days. In some cases it can be triggered by smoking or bright light. In very rare cases eye twitches can be a symptom of a more serious problem known as nystagmus, although this is not a muscle twitch, it is the movement of the eye itself and needs medical treatment.
