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Background Apprentices are usually exposed to the same workplace agents as qualified professionals. There is therefore a risk of the development of occupational allergy in apprentices exposed to high (HMW-A) and low molecular inhalant allergens (LMW-A). Aims To evaluate and compare the occurrence of work-related allergy-like symptoms in apprentices exposed to HMW-A and LMW-A in a culinary and hairdressing school during the first and second year of vocational training. Methods We asked culinary and hairdressing apprentices in their first and second year of vocational training to complete a questionnaire about work-related allergy-like symptoms. In first-year apprentices, we undertook spirometry, skin prick tests for occupational allergens and blood tests for allergen-specific Immunoglobulin E (IgE) antibodies. Results Hypersensitivity to occupational allergens was more frequent in first-year apprentices exposed to HMW-A compared to LMW-A (P < 0.05). Apprentices exposed to LMW-A reported increasing occurrence of skin disorders and upper respiratory tract symptoms between the first and second years of training. First-year apprentices exposed to HMW-A more frequently reported rhino-conjunctivitis and dyspnoea (approximately P < 0.001 and P < 0.05) and those exposed to LMW-A more often reported skin symptoms (P < 0.05). Conclusions Periodic skin and respiratory health surveillance for apprentices exposed to LMW-A or HMW-A might help with early identification and management of occupational allergy. [ABSTRACT FROM AUTHOR]