Cancer screening is the detection of the presence of cancer before any sign or a symptom. Hence allowing very early detection of cancer leading to cure without hassle. There are well-establised cancer screening methods. Cancer screening can be done as national screening or opportunistic screening. For certain cancers, it is ideal to screen vulnerable populations only. For example screening of family members of cancer patients who has evidence to suggest familial cancers or genetically inherited mutations in cancer protection pathways.  There are different screening tools for different cancers.  For breast cancer mammography and an ultrasound scan of the breast. For colorectal cancer fecal cult blood and colonoscopy. For lung cancer chest x-ray and high-resolution computer tomography (CT) in vulnerable populations. The introduction of HPV vaccination prevents more than ninety-five percent of cervical cancers. However regular cancer screening with Pap smear is the standard cervical cancer screening technique. So the public should aware that can er screening at ideal timing is a very important step in their lives in order to achieve a cure without suffering.