I haven't had the urge to poop in 3 days. i have no other symptoms except a cold. what are possible causes? how can i treat this?

Constipation?: If you have never has this problem in the past or is not usual, when we get a cold, which usually is caused by a virus, we should get very well hydrated. In other words, drink plenty of fluids. This is important when we get sick in order to prevent dehydration which could cause some level of constipation. Make sure you also eat high fiber diet. If you get worse should be seen by your pcp.