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Reduced mouth opening (Trismus)

Stiff jaw, Sore jaw, Mouth opening

You may find it hard to open your mouth because of stiffness in your jaw muscles. Reduced mouth opening or difficulty opening your mouth is known as trismus.

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Jaw stiffness can increase slowly over weeks to months after head and neck cancer treatment. This can make eating and speaking more difficult and even be painful to chew or talk.


An easy way to check how wide your mouth can open is to try and put 3 fingers vertically between your upper and lower front teeth. If you can only manage 1 or 2 fingers, you may have a stiff jaw.

We've collected our favourite resources for you to read, watch, listen to, download and share to better understand and manage this concern, as well as clinical services if you would prefer to speak to someone about the emotional challenges of cancer treatment. 
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Reduced Mouth Opening (Trismus)

QLD HEALTH

We recommend this resource because...

Learn more about what Trismus is from the PAH Speech Pathologists.

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Jaw problems after head and neck cancer treatment

MACMILLAN CANCER SUPPORT (UK)

We recommend this resource because...

Good explanation of trismus and common treatments.

Physiotherapy services

Physiotherapists can assist with mobility and physical function before, during and after cancer treatment. If you would like to link with one of our physiotherapists, please ask your treating health professional to send a referral.

Dietitian and nutrition support services

Dietitians can provide support and practical strategies to develop a meal plan that meets your individual needs. If you would like to be linked with one of our dietitians, please ask your treating health professional to send a referral.

Speech Pathologists

Can provide support and help to manage side effects of treatment impacting on eating and drinking. If you would like to link with one of our speech pathologists, please ask your treating health professional to send a referral.

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