One of the most glaring signs of an ascaris roundworm infection is an upper respitory problem that will come and go for no apparant reason. Roundworm eggs are microscopic and travel via the blood to the lungs - here they will settle in to incubate and hatch.
When they hatch - the coughing, phelm and chest heaviness begins. They travel inside the phelm - the phelm is coughed up and swallowed - the larvae can then go into the intestines where they grow, breed and the cycle starts again.
Sometimes a larvae will get "lost" - it will get into the sinus cavaties. It will stay there and grow and can cause a helluva lot of sinus problems.
Any upper respitory problems that seem to cycle for no reason is a sign of ascaris.