I am coughing for a few weeks now on and off and I have a tickle in my throat/chest. What could it be?

It could be either. Stephdee68, its time to see your doctor. Coughing for 2 weeks and tickle could be a post -viral cough, but without listening to your lungs, its all guess work. Go see your doc. If you have allergies, it could be post nasal drip cough. If you have asthma, it could be that. If you have gerd, it also can cause an irritation in the throat. An ENT consult may help.