Ask the doctor: What can be done about a lump in the back of the throat?
Because you say you have extra mucus that you sometimes cough up, then the most likely explanation is that allergies are causing your nose and sinuses to produce extra mucus. At night, when you are lying flat, that mucus collects in the back of your throat. That's why you tend to spit it up in the mornings. The treatment is allergy pills and inhalers.
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