Rectal cancer patients should not drink alcohol, alcohol has carcinogenic risk, and alcohol will produce stimulation to rectal mucosa, rectal cancer patients should quit alcohol. Alcohol has carcinogenic risk, which can directly stimulate cancer cells to make them recur or reduce the treatment effect. Moreover, alcohol is irritating, which stimulates the gastrointestinal tract and may lead to the aggravation of the condition of patients with rectal cancer; in addition, alcohol may react with patients’ therapeutic drugs and cause discomfort and aggravate the adverse reactions. Rectal cancer patients should quit alcohol, actively cooperate with treatment, adjust dietary habits, prohibit spicy and stimulating food, such as ginger, chili, garlic, etc., and keep diet light.