Only in severe cases can allergies be considered part of your disability claim. Typically, common allergies such as seasonal ragweed issues are not going to be considered severe enough to contribute to your disability claim. You need to be complying with your doctor’s advice and prescribed treatment, and usually treatment is effective enough for any type of allergies to prevent allergies from causing severe limitations of function. Severe food allergies are not usually considered a basis for disability because you can avoid them. Any allergy that is triggered by an allergen you can avoid would probably not be a basis for claiming disability.
However, when a person is severely allergic to environmental allergens that are common the outside environment and in work places, those allergies could cause secondary health problems that would prevent you from working, such as asthma attacks. If you have asthma attacks frequently enough, you could be considered disabled. Any condition that would cause you to miss more than 3 days of work per month on average despite your compliance with treatment could be the basis of a disability claim.