Itchy red blood in the eyes may be due to overuse of the eyes, conjunctivitis, allergies, dry eye and other reasons, need to take a general approach to the cause of the disease, topical medication, etc. for relief. 1. Excessive eye use: excessive eye use caused by staying up late for a long time, looking at the cell phone for a long time, reading books, etc., and working in an environment where the light is too dim or too bright, resulting in itchy red blood in the eyes. Need to pay attention to ensure that the eyes get enough rest, avoid excessive use of the eyes, if necessary, you can use the seven leaves of digitalis biside eye drops and so on to improve the relief. 2. Conjunctivitis: Bacteria and other pathogens infecting the eye lead to conjunctival inflammatory lesions, increased capillary permeability, local congestion, inflammatory substances exudate, so the above symptoms. You can apply levofloxacin, tobramycin, erythromycin and other eye drops antibacterial treatment, pay attention to eye hygiene, avoid rubbing the eyes. 3. Allergy: pollen, dust, dander and other allergens induce local allergic reactions after contacting the eye surface, resulting in allergic symptoms such as itching, congestion and edema. Anti-allergy treatment can be applied with drugs such as Olopatadine Hydrochloride. 4. Dry eye: the lack of tear protection and moisturizing of the eye surface due to the decrease of tear synthesis or excessive evaporation of tears will lead to the above symptoms. You can apply sodium vitreous acid eye drops and other drugs to treat it, and at the same time, you should actively remove the triggers of dry eyes. Itchy red blood in the eyes, after resting for a long time without relief, it is recommended that timely medical examination and treatment, drugs need to be used under the guidance of a physician, do not blindly use their own medication.