Methods and items useful at least therein are provided for IBS related testing and treatment. Disclosed is a patch useful in determining if one or more test materials can cause allergic contact dermatitis in a patient. A kit containing information on use and that may include such a patch and/or test material(s) is also disclosed. A method of IBS related testing including performing skin patch testing on a patient presenting IBS symptoms using at least one test material that can cause allergic contact dermatitis is provided. A method for the treatment of IBS which includes limiting the intake by a patient presenting IBS symptoms of at least one material that gives a positive skin patch test result in the patient is also disclosed.
