 [ Symptoms ] sick for 3+ weeks started with mild fever but turned into a cold which has grown progressively worse and will not go away  the main reason i am concerned is because there is a rattling in my chest when i breathe out it is like i can hear the fluid bubbling around deep in my chest when i cough up mucus it is yellow i do not have a fever day quil helps reduces the cough for a bit but not the stuffiness i have also been taking my allergy medicine my sleeping pattern is not very regular but i get at least 8 hours a night is this just a very prolonged cold or should i go to a doctor because of the rattling [ Disease ] one must consider bronchitis and of course various types of pneumonia these are the more common complications of a cold that worsens colds typically last about a week so when you have prolonged and worsening symptoms secondary bacterial infections are a strong possibility you will need to see a medical provider so that you can be properly examined diagnosed and treated     three things unfortunately that cannot be done blindly over the internet