Thanks for your question on Healthcare Magic. I can understand your concern. Yes, coughing from flu cancer cause chest pain. Actually, coughing causes intercostal muscles and ribs contraction. So forceful cough is likely to produce musculoskeletal pain. So follow these steps for better symptomatic relief. 1. Avoid movements causing pain. 2. Avoid bad postures in sleep. 3. Avoid heavyweight lifting and strenuous exercise. 4. Take painkiller like ibuprofen. 5. Apply warm water pad on affected areas. Don t worry, you will be alright with all these in 5 days. For constipation, you should take high fiber diet like green leafy vegetables, fruits etc. Take curd or yogurt daily once a day. Don t worry, you will be alright. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.