Olive oil and garlic are not typically considered causes of hair loss. In fact, olive oil is often used in hair care for its moisturizing properties, and garlic is sometimes believed to promote hair growth due to its potential to improve circulation and provide nutrients to the hair follicles. However, if you have a specific sensitivity or allergy to these ingredients, they could potentially cause scalp irritation, but this is rare. Always do a patch test before using any new hair care products to check for adverse reactions.