Shampoos seldom cause irritation. Hair dyes & perming solutions, on the other hand, have the higher chances of triggering scalp allergies. Allergic reactions give rise to inflammation of the scalp, which in turn lead to hair loss. Therefore, hairstylists should always check to see if their clients have allergies towards any hair care or styling products. Additionally, forceful pulling as well as overheating of the hair can also damage the hair follicle, causing the hair to be susceptible to falling.