Does Perfume on the Neck Harm Your Thyroid? Here’s What Science Says

There is no evidence that spraying perfume on the neck poses a unique risk to the thyroid gland, despite claims circulating on social media about hormone disruption and chemical exposure.

The thyroid is a butterfly-shaped gland at the base of the neck. It lies beneath the skin and layers of connective tissue and muscle. Chemicals absorbed through the skin enter the bloodstream and circulate throughout the body rather than being directed to nearby organs. Inhalation of sprayable cosmetics is also considered in product safety assessments, but this does not result in a specific exposure risk to the thyroid.

Concerns about perfume ingredients have often focused on phthalates, a broad group of chemicals with different uses and properties. Diethyl phthalate (DEP), which can be used in fragrances, has been associated with measurable exposure among perfume users. A 2024 systematic review found associations between phthalate exposure and thyroid hormone levels in children and adolescents. 

However, the findings were inconsistent and did not establish a causal relationship.

The studies included in the review examined exposure from several sources and did not specifically investigate perfume applied to the neck or the risk of thyroid disease. Regulatory authorities note that the potential risk from chemical exposure depends on factors including dose, timing and route of exposure. Findings from laboratory studies also cannot automatically be applied to typical everyday exposure.

The more established health effects associated with perfume involve the skin. Allergic contact dermatitis can affect up to 2.6% of the population and may cause itching and a rash after a person becomes sensitised to fragrance ingredients. Some perfumes can also cause phototoxic reactions when the skin is exposed to sunlight, particularly products containing bergamot oil.

Poikiloderma of Civatte, a skin condition that can affect the neck, is associated primarily with long-term sun exposure rather than perfume use. Perfume odours have also been reported as migraine triggers, although evidence for this remains largely anecdotal.

In Great Britain and Northern Ireland, cosmetic products must undergo safety assessments before they are placed on the market. These assessments consider factors including ingredients, concentrations and expected levels of exposure. Fragrance allergens must be declared on labels when they exceed specified thresholds.

Terms such as “phthalate-free” and “natural” do not necessarily mean that a product is safer. Essential oils can cause allergic reactions, while alternative ingredients may have their own potential risks.

For most people, there is no thyroid-related reason to avoid applying perfume to the neck. Cancer Research UK states that there is no evidence linking perfume use with cancer. The most practical advice is to stop using a product if it causes burning or a rash and seek medical advice if symptoms persist.