Breast lump is the most typical symptom of early breast cancer. Tumors are usually unilateral, single, hard, irregular in edge and not smooth in surface, so they are not easy to be pushed. Most of them are painless masses, and a few have varying degrees of dull pain or tingling. 2. abnormal breast skin

when a breast lump invades the ligament between the breast gland and the skin, it will shorten the ligament and lose its elasticity, pulling the skin at the corresponding part to form a depression, like a dimple, which is a typical "dimple sign". 3. Abnormal nipple and areola < P > When a lump invades the nipple or areola, it will pull the nipple, make it sag, deviate, or even completely retract behind the areola. Some special types of breast cancer may also have itching, erosion and ulceration of the skin around the nipple and areola. 4. nipple discharge

the nipple suddenly exudes liquid, which may be blood, serous fluid, milk or pus. 5. Axillary lymph nodes are swollen < P > Occasionally, swollen lymph nodes are found in the axilla, which may change from small to large, from few to many, or even merge with each other. If someone occasionally finds himself with the above symptoms in his life, he should pay great attention to it. It is recommended to seek medical treatment as soon as possible and do relevant examinations to achieve early detection and early treatment. Second, ways to prevent breast cancer:

1. Diet. Eat less oil, salt and sugar, and eat less processed foods, such as smoked food, processed cooked food, canned food and other stale foods. Eat more fresh vegetables, fruits and coarse grains, and increase the intake of dietary fiber, because dietary fiber helps to excrete estrogen and prevent excessive estrogen from stimulating breast cancer.

2. Quit smoking and drinking. Smoking can cause a variety of cancers, and breast cancer is no exception. Drinking alcohol will affect the secretion of prolactin in pituitary gland, which is closely related to breast cancer.

3. Don't wear underwear too tightly. Underwear is too tight, which leads to the obstruction of lymph circulation in the breast, and can not eliminate harmful substances in time, which is easy to promote the canceration of normal cells.

4. Exercise to reduce fat and control weight. Obesity is an important risk factor for breast cancer, so it is very important to keep exercising and not to get fat. In fact, obesity is the root of all diseases, which is really harmful.

5. Do not abuse exogenous sex hormones. Long-term use of cosmetics containing estrogen, long-term use of contraceptives, and estrogen replacement therapy for menopausal women are all likely to increase the risk of breast cancer.