Breasts like a tendon pulling pain consider breast hyperplasia, mastitis, breast cancer and other diseases related. 1. Breast hyperplasia: It is usually caused by endocrine hormone disorders. When endocrine hormone disorder, can break the balance between the breast gland cell proliferation and recuperation. This leads to unbalanced proliferation of the mammary glands, resulting in swelling, tingling and tenderness in the breasts. Especially before and after menstruation, the breasts will experience pain similar to cramps, and the pain can involve the same side of the armpits and the back of the shoulders. 2. Mastitis: Commonly found in breastfeeding women. When breastfeeding women’s milk stagnates in the breast for a long time, it will cause inflammation and lead to mastitis. As a result, redness, swelling, heat and pain will appear in the breasts, and there will also be the feeling of a tendon pulling pain under the breasts. 3. Breast cancer: when the cancer cells spread deep into the breast and invade other glands and muscle tissues, it can produce tugging pain when moving around. For example, when breast cancer grows outward and invades Cooper’s ligament, it can cause cramp-like pain in the breast. And with the development of the disease, in the advanced stage, there are localized skin orange peel signs. When breast pain and discomfort occurs, it is recommended to consult a doctor as soon as possible for a clear diagnosis and timely treatment to avoid delaying the condition.