The BreastScreen NSW mobile van is in town from January 15 to 19 at the Museum car park providing free mammograms to eligible women.

In NSW one in seven women will develop breast cancer in their lifetime, a mammogram can pick up cancers that cannot be seen or felt.

For women over 50 years, a mammogram is the most effective method of finding breast cancer early.

Director of BreastScreen Greater Western NSW, James Harvey said a screening mammogram is one of the most important things women aged 50-74 can do for their health.

"A mammogram every two years takes just 20 minutes and it could save your life," he said.

"Detecting breast cancer early increases your chance of survival while reducing the likelihood of invasive treatment, such as mastectomy or chemotherapy."

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Many women believe they aren't at risk of breast cancer because there's no family history of the disease.

However about 90 per cent of women diagnosed with breast cancer have no family history, which is why Mr Harvey said breast cancer screening is so important for eligible women.

He said having a BreastScreen NSW van in Nyngan made it easier for women to attend their recommended two-yearly screening.

"Bringing these vital services to Nyngan means more local women can participate and get the support they need," he said.

"Life gets busy and we want women to make their health a priority."

BreastScreen NSW mobile vans include the latest digital mammography technology and secure wireless communication system. The NSW Government, through the Cancer Institute NSW, is investing $62.2 million in breast cancer screening this financial year.

The service is free and there's no referral needed.

Book a mammogram with BreastScreen NSW phone 13 20 50 or book.breastscreen.nsw.gov.au

Year round screening services are available at BreastScreen NSW clinics at Bathurst, Broken Hill, Dubbo and Orange.