Reason 1: Allergic reaction
One of the first reasons you may be dealing with throat tightness is because something you ate or were exposed to may have triggered an allergic reaction. This generally happens when your body reacts to something generally harmless (like pollen or peanuts) and it thinks it is a dangerous invader for the system. This reactive reaction is what causes you to get watery eyes and a runny nose.
In some more severe cases, it happens that your body reacts in a more extreme way, which is called anaphylaxis. This can be caused either by medicine you have taken that your system is not compatible with, foods you may be allergic to, or an insect sting or bite. The reaction can happen immediately (in the case of more severe allergic reactions), while others may take up to a few hours after you have been exposed to the substance.
