What are the causes of oily hair?

The excess sebum production responsible for oily hair can be linked to internal and/or external causes.

Internal causes:

• Sebaceous glands being hypersensitive to hormonal stimuli. In both men and women, the sensitivity of sebaceous glands to androgen hormones dictates their sebum secretion.
• Drug-related (some psychotropics)
• Stress, anxiety

External causes:

• Poorly adapted hair care products (shampoo, overuse of coloring products, etc) that are too aggressive on the scalp and cause it to respond by producing too much sebum
• Using water that is too hot to rinse the hair
• Using styling tools that are too hot near the roots, and prolonged sun exposure can also stimulate sebum production in the scalp
•  Mechanical aggressions to the scalp, such as intense rubbing while washing or towel drying