A foreign body sensation without a foreign body in the eye may be caused by dry eye, infectious conjunctivitis, eye allergy, etc. Patients can be treated with medication to promote recovery. 1. Dry eye: because of the instability of the tear film and the dryness of the surface of the eye, patients with dry eye may experience dryness, foreign body sensation and other discomfort. Patients can follow the doctor’s instructions to use tobramycin eye drops and other medications to relieve eye discomfort. 2. Infectious conjunctivitis: bacterial, viral, Chlamydia trachomatis and other pathogenic bacteria infection caused by conjunctivitis, under the stimulation of inflammation, patients may appear photophobia, tearing, foreign body sensation and other uncomfortable symptoms. 3. Eye allergy: allergic patients who are allergic to pollen, hair and other allergens, patients with allergic conjunctivitis, patients may appear photophobia, tearing, itchy eyes, can also be accompanied by foreign body sensation. It is recommended that patients with obvious foreign body sensation in the eyes should consult a doctor in a timely manner to assess their condition and follow the doctor’s instructions for treatment.