Chest tightness and breast pain are primarily considered to be caused by breast hyperplasia or mastitis. It is recommended to visit a hospital for an examination, including a breast ultrasound, to identify the cause and receive appropriate treatment. Diet should be light, avoiding spicy, greasy, cold, and irritating foods. It is also important to check for symptoms of pregnancy using a test strip. If pregnancy is ruled out, the symptoms may be due to breast hyperplasia or mastitis. Under a doctor's guidance, anti-inflammatory and anti-infection medications should be taken as treatment. Additionally, maintaining a good mood, avoiding anger, ensuring adequate sleep, and not staying up late can significantly aid in recovery from illness.