Sudden foreign body sensation in the patient’s eyes may be caused by physiological reasons, eye inflammation, dry eye and so on. 1. Physiological reasons: if the patient is engaged in computer workers for a long time, playing cell phones or wearing contact lenses for a long time, it will easily lead to overuse of the eyes, causing visual fatigue, and the patient may have the discomfort of a foreign body sensation in the eyes. 2. Ocular inflammation: when patients have conjunctivitis, keratitis and other ocular inflammation, due to inflammation stimulation, patients may have a sudden foreign body sensation in the eyes, which may be accompanied by increased secretion, photophobia, tearing and other uncomfortable symptoms. 3. Dry eye: dry eye patients due to insufficient tear secretion or evaporation too fast, resulting in reduced stability of the tear film of the eyes, dry eyes, foreign body sensation, sticky secretion, itching and other discomfort symptoms. 4. Other: In addition, if the patient’s eyes into the sand, dust, will make the eyes by a certain degree of stimulation, the eyes suddenly have a foreign body sensation, tearing and other discomfort symptoms. It is recommended that patients with sudden foreign body in the eyes and other discomforts should consult a doctor in time to evaluate their condition and follow the doctor’s instructions for treatment.