1.At least once a month, touch the neck, armpit and groin by yourself to check whether there are enlarged lymph nodes (generally, lymph nodes smaller than the size of peanut rice are considered normal), how the texture of the enlarged lymph nodes is, whether they are fixed, and whether there is any pressure pain. 2.When coughing for a long time, you should pay attention to whether there is blood mixed with the coughing sputum, the time of coughing, the site of chest pain, the amount of blood and the color of the blood, etc. 3.When there is loss of appetite and wasting, epigastric pain, if accompanied by nausea and vomiting, pay attention to whether there are black-brown contents in the vomit, and observe whether the stool is tarry or with blood. Whether the shape of the stool has changed. 4.After menstruation, women should look in the mirror and observe whether there is a lump in their breast; how hard the lump is, how mobile it is, and whether it adheres to the skin; whether there is an “orange peel-like” change in the skin of the breast; whether there is an enlarged lymph node in the armpit on the same side of the breast with the lump. 5. Women should pay attention to whether the leucorrhea is mixed with bloody secretions and whether the leucorrhea has a fishy odor. 6, the habits of stool and urine have not changed, especially pay attention to whether there is a painful feeling when stool, a feeling of falling and the shape of the baked stool has not changed. When urinating, observe whether there is white discharge, whether there is hematuria, whether there is discomfort in the perineum, etc. 7, long-term hoarseness, should look in the mirror, open wide and breathe deeply, observe whether there are enlarged tonsils and other swellings in the throat. 8.Men should pay attention to whether the foreskin of the penis is too long, whether there are ulcerated nodules at the urethra, whether there are ulcerated nodules in the coronary sulcus of the penis, and whether there are cauliflower-like swellings in the coronary sulcus of the penis that can bleed easily. 9.In case of long-term fever of unknown origin, attention should be paid to the measurement of body temperature; if necessary, further examination of blood routine and blood sedimentation should be done. 10.If there is pain in the extremities after strenuous activity and the activity is restricted, attention should be paid to whether there is swelling in the joints of the extremities and whether there is a palpable swelling under the skin. 11.Keep an eye on the changes of moles in various bodies on the surface of the body. It is recommended that cancer screening should be done regularly to nip the disease in the bud. The medical checkup center has formulated scientific medical checkup packages for various types of cancer screening, so that it is convenient for people to choose the examination items reasonably when conducting cancer screening.