The perception of chronic migraines as "just headaches" need to change in the workplace. 

An Otago University study shows nearly a quarter of participants experience the disease for at least 15 days a month. 

It's suggested it causes significant levels of disability and limits people's ability to work and socialise. 

Researcher Sue Garrett told Mike Hosking that employers need to recognise how bad it can get. 

She says people would drug up before going to work and spend their day offs recovering. 

Garrett says people want to work but would like more support in the workplace. 

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