Constipation Make an Appointment Refer a Patient Ask a Question Reviewed by Bronwyn Long, DNP, MBA, RN, Jeffrey Kern, MD, Laurie L. Carr, MD (October 01, 2019) Lung cancer therapy, or treating the symptoms of lung cancer, may cause constipation. When you are constipated, you may have fewer bowel movements than what is normal for you. Your bowel movements may be hard or dry, and more difficult to pass. Changes in bowel function can be caused by changes to your body’s metabolism. These can be caused by disease, medications, dehydration or changes in daily habits and activities that disrupt your bodily functions. Medications That Can Cause Constipation Chemotherapy Pain medications Anti-nausea medications It is important to treat constipation for your comfort and quality of life. When your platelet counts are low (thrombocytopenia), you are at increased risk for rectal bleeding while constipated. Non-Medication Treatments Drink prune or apple juice as needed Eat fruits, vegetables and whole-grain foods to increase your fiber intake. Fruits: dried prunes, apricots, raisins Vegetables: raw or cooked broccoli, green beans, spinach, leafy green salads Breads and grains: bran muffins or cereal, brown rice, whole-wheat bread Nuts and seeds: Walnuts, popcorn, sunflower seeds Engage in moderate exercise (e.g., walk around the block) for 15-30 minutes daily to help bowels move. Drink a lot of water (e.g., at least eight glasses daily) to help prevent dehydration, which can increase constipation. Medication Treatments Talk with your doctor about developing a bowel program that will meet your needs. When to Call the Doctor Call within 24 hours if you experience the following: Pain in your stomach Fever Inability to pass gas Nausea or vomiting with your constipation No bowel movement within three days after taking laxatives as recommended Swelling of your stomach, or if it feels hard to the touch Chemotherapy-Induced Nausea and Vomiting (CINV) Cough Clinical Trials For more than 100 years, National Jewish Health has been committed to finding new treatments and cures for diseases. Search our clinical trials.