This is an interesting problem, as is often the case with coughing. While it is a very common condition, there is much that we do not know about coughing, and there are many people that suffer from a chronic cough for no obvious reason. That is why it's important to discuss this with your doctor
. In your specific case, there could be many things that are causing this cough. Many people will have some reflux when they bend over, especially suddenly, and this can be enough to trigger a cough in some people. For others, the change in blood flow or pressure can be enough to start a coughing fit. There are many other reasons as well, some of which could need treatment in a short manner. As with everything, the best thing for you to do is to speak with your doctor soon to determine what is the best method to fix the coughing for you, after determining what is causing the cough. Your doctor will know other things about your health history, such as whether or not you have lung or heart problems that could be contributing. Please speak with your doctor to start yourself on the right road to getting the answer you need to feel better shortly.