Hello madam and thanks for using healthcaremagic,
Mucus is produced by the glands in the nose , sinuses
and throat normally. The amount and character of mucus may vary from person to person.
Also throat clearing becomes like a habit in many people.
Excessive throat clearing can be a symptom of an indolent sinus infection.
The mucus from the sinus drains into the throat and can give rise to foreign body sensation and can result in throat clesaring.
Please see an ENT specialist
to rule out the same.
People with allergic rhinitis
(allergy in the nose ) can also have excessive mucus production in the nose and sinuses.
Since you have no other symtpoms for the past 2 years and the sputum is white and odorless I do not think there is anything serious going on.
Please see an ENT. You may need a nasal endoscopy
as well. Tell tale signs of sinusitis
an allergy can be seen in nasal endoscopy.
Dr Rajkishori Godhi