Hard lumps with pain in the breasts after weaning are mainly considered to be related to factors such as milk stagnation, mastitis, breast hyperplasia and tumors. 1. Milk stagnation: After weaning, milk stagnates in the breasts, which can lead to hard lumps and pain and other discomforts. 2. Mastitis: Inflammatory stimulation can lead to localized hyperplasia in the affected area, resulting in hard lumps on the breasts, pain, fever and other uncomfortable symptoms. 3. Mammary hyperplasia: benign lesions of the mammary gland, which can lead to symptoms of hard lumps and bumps in the breasts, as well as symptoms of breast pain. 4. Tumor disease: such as breast fibroma, breast cancer, etc., which can also lead to lumps in the breasts, accompanied by pain and other uncomfortable symptoms. The appearance of such symptoms may also be related to other factors. It is recommended that patients seek timely medical examination for targeted disposition.