** Thanks for contacting with your health concern 1. since you are suffering from diabetes thus it must be remembered that poorly controlled or long-term diabetes may lead to diabetic neuropathy causing damage to nerves controlling the digestive tract and resulting in constipation, diarrhea so check with your blood sugar level and/or consult with your primary care doctor or an Endocrinologist if this happens to be the cause 2. Since with chemotherapy, associated drugs are given to manage pain, nausea/ vomiting, depression which can cause constipation as a side effect. 3. As constipation is chronic thus consult with your primary care doctor as he will be in better condition as how to approach the symptom, till then . Take old brown rice, green gram, chickpea, green vegetables, bottle gourd, water, papaya, grapes, muskmelon, raisins, dates, orange, pears, guava, apricot, honey, milk. . Avoid newly harvested rice, black gram, peas, banana, potato, spicy/junk food, late nights, sedentary lifestyle. . Purgation with olive oil is best and free of side effect . Early morning: eat 10 cashew nuts and 4 raisins and drink water after coming out of bed . Do exercise which increases the tone of abdominal muscles and stimulates peristalsis like: . Straight leg raising . Scissor kicks . Sit-ups . Walking, jogging PS. As a rule, one should always palpate the abdomen, and if there is tenderness, never give enema or strong purgatives