Cancer is a malignant disease formed only after the accumulation of genetic changes to a certain extent. It has a long latent period and is difficult to be detected in the early stage, and most of the symptoms are already in the middle or late stage when they become obvious. There are many parts of the human body that can cause cancer, how to check them? Skin From the head to the soles of the feet, carefully examine every inch of the skin, including the chest, the back, the buttocks and the four skins, and observe whether there are any abnormal changes, such as whether there is any change in the size, color and surface of the scars, whether the wounds and ulcers on the skin have not healed for a long time, whether the skin color is abnormal in a certain place, whether there is pain and cancer, numbness, etc. Head First, see if the face is symmetrical and puffy from left to right, and if there is any increase or change in the lumpy spots. Then look at whether the whites of the eyes are yellow and red, whether the eyes are pale and lifeless, and whether the angle of service is normal. Then use the index finger to lightly push the tip of the nose upward to see if there is any change in the nostrils, and then lightly mold the outside of the nose to see if the skin is swollen or abnormal. Finally, use the thumb, index finger and middle finger to gently pinch the ears to see if there is any pain or hard lumps. Oral cavity The color, opening and closing movement and shape of the lips will be examined to see if there is any difference, and then the lips will be touched to see if there are hard lumps. There is also stretching and flipping of the tongue to observe whether there is vibration, asymmetry, unrestrained movement and abnormal color, and whether there is curvature and enlargement of the surface, tip and edge of the tongue. Head examination Gently touch and move all the lymph node tissues around the head with the index and middle fingers, including the front of the ear, under the collar, under the collar, tonsils, deep neck chain, clavicle and behind the ear, occipital bone, superficial neck and posterior neck chain, etc. Pay attention to any abnormalities in size, shape and outline, and if there are, pay attention to whether there is unilateral nasal congestion, nosebleeds or ear congestion, and seek medical consultation as soon as possible. Breasts Women should usually perform a breast examination within one week after menstruation (or any day if they have stopped menstruating). First, both breasts should be naturally lowered and observed for abnormal size, height, shape, and nipple changes, and light pressure on the nipples to see if there is fluid drainage. Then raise both arms and do the same examination. Next, lie on your back, with one hand under your head, and with the other hand, gently press the five fingers in a clockwise direction from the outside to the inside to check if there is a hard lump, thickening or pain, alternating between the two hands. Attention should be paid to the lateral upper part and the subabdominal lymph nodes for any abnormalities. Abdominal examination First observe the abdominal shape, pattern, color and blood arm, hair for any abnormal changes, belly button for any discoloration or secretion. Then the body lies flat, both knees are bent, relax the abdomen, and press the abdomen with five fingers together to check for hard lumps or pain. The pubic area Middle-aged and elderly men should often feel their gau and penis for hard lumps or other abnormalities, then feel the lymph nodes in the fornix, and now check the glans. When touching the gau, you can press the index and middle fingers on one side and the thumb on the other side, and be careful of any protrusions or other changes. The color, consistency and smell of the sputum and whether it is mixed with blood are observed. Then look at the color of urine, flow rate and volume of urine for intercourse. Next, look at the color of the stool, the presence of blood clots, thickness, and changes in hardness.