What could be causing my left upper eyelid to keep twitching?

Left upper eyelid twitching may be caused by various factors. Physiological causes may include excessive fatigue, eye strain, lack of sleep, and excessive caffeine intake, all of which can lead to eye muscle fatigue or tension, resulting in eyelid twitching. Pathological conditions such as eye inflammation (e.g., conjunctivitis, keratitis), facial nerve spasms, or eye injuries may also cause eyelid twitching, as these diseases or injuries directly affect the eye muscles or nerves. Psychological factors such as high stress levels or emotional fluctuations can likewise contribute to eyelid twitching. If the twitching persists for a long time or occurs frequently, it is advisable to seek medical attention promptly to determine the underlying cause and receive appropriate treatment. Additionally, maintaining healthy lifestyle habits and a positive mental state are key to preventing eyelid twitching.