There are no rules about which three types of tea you can’t drink for breast cancer, so it’s not true. Breast cancer patients can drink tea in moderation, but try to avoid strong tea or overnight tea. Drinking tea for breast cancer patients will not affect the treatment effect and will not cause tumor recurrence and metastasis, but it should be consumed in moderation. Breast cancer in the process of radiotherapy will damage patients’ sense of taste, and there will be a bitter and tasteless situation in their mouths, so the patients can drink some green tea, oolong tea, and flower tea in moderation. Breast cancer patients should avoid drinking some too strong tea, so as not to have too much theophylline-like substances in the body, leading to nerve excitation and affecting sleep. They should also avoid drinking tea before going to bed or taking medicines with tea so as not to affect the efficacy of medicines. Breast cancer patients should pay attention to reduce the intake of high-fat food in their daily life diet, consume more fresh vegetables and fruits, have a balanced diet and supplement nutrition.