As winter leaves, the weather gradually warms up, and all kinds of flowers compete to bloom, some people’s eyes start to experience itchiness, redness, foreign body sensation, tearing and other discomforts in such a season. Yes, this is allergic conjunctivitis! Some people are familiar with this disease because its allergic all year round; some don’t know much about it because its easy to be allergic only in such seasons; and some don’t know about it because its allergic only in specific situations. Regardless of the type of allergic conjunctivitis, the cause is related to one’s own constitution, which is inherent and usually remains for life, but the onset of the disease requires one necessary condition – exposure to allergens. Therefore, to treat allergies means to cut off the process of their occurrence and development. From a generalized point of view, allergy is originally a reaction of the body to the rejection of an undesirable stimulus, warning the individual of the need to avoid the undesirable stimulus in order to avoid damaging the body, regardless of whether the exposure to certain substances will actually damage the body’s health, the body has already blacklisted these substances as harmful substances for rejection. Allergy is also an inflammatory disease, but usually inflammation has the characteristics of redness, swelling, heat and pain, but the difference with allergy is only in the degree of redness, swelling and itching, because the inflammation is mild, so the local heat is not obvious, and the stimulation of the nerves is only itchy, not to the extent of pain. In case of severe allergy, we usually tend to classify it as poisoning, such as severe drug rash. So, although allergies feel simple and not very harmful, they can actually be life-threatening at times, such as laryngeal edema. If we usually find ourselves allergic to any substance we should write it down so that we can inform our doctor later when we have allergic symptoms ourselves, which will be helpful for diagnosis and treatment. For the treatment of allergies, we will now take allergic conjunctivitis as an example and make a brief introduction. First, you need to look for allergens. You can do allergen testing to find out if you are allergic to common allergens, but of course, if you are not allergic to common allergens, you cannot find out. But if you are lucky enough to find out, you should find a way to isolate the allergen, such as changing your position if you are allergic to dust in your work environment; if you are allergic to pets, you should stop keeping pets; if you are allergic to dust mites, you should clean and disinfect your bedding and clothes. If you are still allergic to these things, you can go to the hospital for desensitization treatment. Secondly, when you know you are going to be allergic, control it with medicine first. If you are allergic to seasonal conjunctivitis, usually to pollen, you can start using sodium cromoglycate drops when the flower bones grow, because it takes a week for the drops to start working, which is a bit of a hassle, but as a good and inexpensive medicine, it is worth considering. Again, if you are already allergic, then you should only use fast-acting anti-allergy drugs. For example, naphazoline eye drops can be used for mild allergies, where only congestion and mild eye itching without other discomfort is indicated. Some of the more rapid-acting anti-allergy medications include Emetine eye drops. Stronger effects are hormonal eye drops, such as dexamethasone drops, but they can only be used for emergencies, not for long periods of time, and can easily cause glaucoma, etc. If this does not work, immunosuppressants will be needed, which will have to be seen by an ophthalmologist. When allergic conjunctivitis is accompanied by skin manifestations, or when no suitable eye drops are found for the time being, oral anti-allergy drugs can be taken. For example, paracetamol, as it can cause drowsiness, can be given as loratadine if you need to keep your energy up. Intravenous calcium gluconate injections are also effective for quick relief of allergy symptoms. Cold compresses are also commonly used as an anti-allergy tool to reduce itching and edema.