If you have found an unusual lump, changed or a new birthmark, or the signs of cancer listed above, you should go to a doctor.
Besides, it is advised to do certain examinations with a certain periodicity. For instance, women over 40 years old are recommended to undergo a mammogram and once a year. It is in general advised for women to get their reproductive organs checked at gynecologist and via ultrasound once a year and do self-breast exam once a month to identify any possible changes in the breasts at an early stage.
Smokers and individuals who work with gases, vapors, or other harmful substances inhaled are advised to do lung x-ray once a year.
People older than 50 years are advised to do colonoscopy once a year or two years contingent on the present diseases.
In general, if you have any chronic diseases or diseases running in your family, it is advised to get checked at least once a year to identify any negative patterns at an early stage of their development.